$ADTN
ADTRAN Holdings, Inc. Stock $adtn

$adtn Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000156459017002423 Filed on February 24, 2017

Income Statement

Concept	2016 Q4	2015 Q4	2015 Q3
Revenue	$163.0M	$139.0M	$158.1M
YoY Change	17.25%	-3.45%	-2.96%
Cost Of Revenue	$92.20M	$76.60M	$87.43M
YoY Change	20.37%	1.73%	3.3%
Gross Profit	$70.79M	$62.44M	$70.65M
YoY Change	13.37%	-8.83%	-9.72%
Gross Profit Margin	43.43%	44.92%	44.69%
Selling, General & Admin	$34.40M	$30.30M	$30.02M
YoY Change	13.53%	-3.81%	-7.47%
% of Gross Profit	48.6%	48.53%	42.49%
Research & Development	$32.10M	$29.30M	$32.56M
YoY Change	9.56%	-6.09%	-2.29%
% of Gross Profit	45.35%	46.93%	46.09%
Depreciation & Amortization	$4.100M	$3.400M	$3.500M
YoY Change	20.59%	-8.11%	-2.78%
% of Gross Profit	5.79%	5.45%	4.95%
Operating Expenses	$66.50M	$59.60M	$62.58M
YoY Change	11.58%	-4.94%	-4.84%
Operating Profit	$4.272M	$2.800M	$8.072M
YoY Change	52.57%	-29.63%	-35.4%
Interest Expense	$2.900M	$2.300M	$151.0K
YoY Change	26.09%	360.0%	0.67%
% of Operating Profit	67.88%	82.14%	1.87%
Other Income/Expense, Net	-$300.0K	$100.0K	$52.00K
YoY Change	-400.0%	-97.44%	-105.4%
Pretax Income	$6.800M	$5.200M	$10.87M
YoY Change	30.77%	-38.1%	-27.81%
Income Tax	-$700.0K	-$500.0K	$3.805M
% Of Pretax Income	-10.29%	-9.62%	35.0%
Net Earnings	$7.572M	$5.718M	$7.067M
YoY Change	32.42%	-38.46%	-37.6%
Net Earnings / Revenue	4.65%	4.11%	4.47%
Basic Earnings Per Share	$0.16	$0.12	$0.14
Diluted Earnings Per Share	$0.16	$0.12	$0.14
COMMON SHARES
Basic Shares Outstanding	48.40M	49.56M shares	49.86M
Diluted Shares Outstanding			49.93M

Balance Sheet

Concept	2016 Q4	2015 Q4	2015 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$123.1M	$118.9M	$125.8M
YoY Change	3.53%	-1.25%	10.35%
Cash & Equivalents	$79.90M	$84.55M	$83.69M
Short-Term Investments	$43.20M	$34.40M	$42.10M
Other Short-Term Assets	$16.50M	$29.00M	$23.40M
YoY Change	-43.1%	29.46%	9.35%
Inventory	$105.1M	$91.53M	$100.7M
Prepaid Expenses			$5.935M
Receivables	$92.35M	$71.92M	$86.18M
Other Receivables	$15.14M	$19.32M	$20.86M
Total Short-Term Assets	$352.9M	$311.9M	$357.0M
YoY Change	13.16%	-11.17%	2.35%
LONG-TERM ASSETS
Property, Plant & Equipment	$84.47M	$73.23M	$73.66M
YoY Change	15.34%	-2.13%	-2.05%
Goodwill	$3.492M	$3.492M	$3.492M
YoY Change	0.0%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$176.1M	$198.0M	$204.5M
YoY Change	-11.06%	-29.44%	-31.49%
Other Assets	$12.23M	$9.276M	$9.893M
YoY Change	31.89%	-15.23%	-15.79%
Total Long-Term Assets	$314.3M	$321.0M	$314.9M
YoY Change	-2.09%	-17.17%	-21.66%
TOTAL ASSETS
Total Short-Term Assets	$352.9M	$311.9M	$357.0M
Total Long-Term Assets	$314.3M	$321.0M	$314.9M
Total Assets	$667.2M	$632.9M	$671.9M
YoY Change	5.42%	-14.32%	-10.51%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$77.34M	$48.67M	$69.37M
YoY Change	58.92%	-13.73%	38.82%
Accrued Expenses	$12.43M	$12.11M	$13.43M
YoY Change	2.69%	9.31%	8.67%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$126.5M	$92.64M	$127.0M
YoY Change	36.58%	-22.15%	8.6%
LONG-TERM LIABILITIES
Long-Term Debt	$26.80M	$27.90M	$28.80M
YoY Change	-3.94%	-3.13%	-4.0%
Other Long-Term Liabilities	$28.05M	$24.24M	$29.68M
YoY Change	15.74%	-21.63%	26.04%
Total Long-Term Liabilities	$54.85M	$52.14M	$58.48M
YoY Change	5.21%	-12.71%	9.21%
TOTAL LIABILITIES
Total Short-Term Liabilities	$126.5M	$92.64M	$127.0M
Total Long-Term Liabilities	$54.85M	$52.14M	$58.48M
Total Liabilities	$187.7M	$152.7M	$194.2M
YoY Change	22.9%	-19.47%	5.35%
SHAREHOLDERS EQUITY
Retained Earnings	$921.9M	$906.8M	$905.9M
YoY Change	1.67%	-0.11%	0.24%
Common Stock	$253.8M	$247.7M	$247.4M
YoY Change	2.45%	2.08%	2.78%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$684.0M	$665.3M	$665.4M
YoY Change	2.81%	10.65%	13.99%
Treasury Stock Shares	$31.18M	$30.09M	30.09M shares
Shareholders Equity	$479.5M	$480.2M	$477.6M
YoY Change
Total Liabilities & Shareholders Equity	$667.2M	$632.9M	$671.9M
YoY Change	5.42%	-14.32%	-10.51%

Cashflow Statement

Concept	2016 Q4	2015 Q4	2015 Q3
OPERATING ACTIVITIES
Net Income	$7.572M	$5.718M	$7.067M
YoY Change	32.42%	-38.46%	-37.6%
Depreciation, Depletion And Amortization	$4.100M	$3.400M	$3.500M
YoY Change	20.59%	-8.11%	-2.78%
Cash From Operating Activities	$14.20M	-$4.800M	$2.100M
YoY Change	-395.83%	-132.43%	-88.33%
INVESTING ACTIVITIES
Capital Expenditures	-$8.700M	-$4.000M	-$2.400M
YoY Change	117.5%	29.03%	-27.27%
Acquisitions
YoY Change
Other Investing Activities	$14.00M	$15.10M	$18.80M
YoY Change	-7.28%	-44.89%	-9500.0%
Cash From Investing Activities	$5.200M	$11.10M	$16.40M
YoY Change	-53.15%	-54.32%	-582.35%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-4.700M	-5.800M	-20.90M
YoY Change	-18.97%	-74.56%	55.97%
NET CHANGE
Cash From Operating Activities	14.20M	-4.800M	2.100M
Cash From Investing Activities	5.200M	11.10M	16.40M
Cash From Financing Activities	-4.700M	-5.800M	-20.90M
Net Change In Cash	14.70M	500.0K	-2.400M
YoY Change	2840.0%	-96.93%	-300.0%
FREE CASH FLOW
Cash From Operating Activities	$14.20M	-$4.800M	$2.100M
Capital Expenditures	-$8.700M	-$4.000M	-$2.400M
Free Cash Flow	$22.90M	-$800.0K	$4.500M
YoY Change	-2962.5%	-104.47%	-78.87%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2015Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	19000
CY2015Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	10145000
CY2015Q4	us-gaap	Assets Current AssetsCurrent	311862000
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	73233000
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	37015000
CY2015Q4	us-gaap	Goodwill Goodwill	3492000
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	79895000
CY2016Q4	us-gaap	Short Term Investments ShortTermInvestments	43188000
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	92346000
CY2016Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	15137000
CY2017Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	48519654
CY2016Q2	dei	Entity Public Float EntityPublicFloat	903566094
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	84550000
CY2016	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2016	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2016	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2015Q4	us-gaap	Short Term Investments ShortTermInvestments	34396000
CY2015Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	71917000
CY2015Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	19321000
CY2016Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	760000
CY2016Q4	us-gaap	Inventory Net InventoryNet	105117000
CY2015Q4	us-gaap	Inventory Net InventoryNet	91533000
CY2016Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	16459000
CY2016Q4	us-gaap	Assets Current AssetsCurrent	352902000
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	84469000
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	38036000
CY2016Q4	us-gaap	Goodwill Goodwill	3492000
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	12234000
CY2015Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	9276000
CY2016Q4	us-gaap	Long Term Investments LongTermInvestments	176102000
CY2015Q4	us-gaap	Long Term Investments LongTermInvestments	198026000
CY2016Q4	us-gaap	Assets Assets	667235000
CY2015Q4	us-gaap	Assets Assets	632904000
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	77342000
CY2015Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	48668000
CY2016Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	16326000
CY2015Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	16615000
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-10828000
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	9752000
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	33792000
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55120000
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-7032000
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	51267000
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55482000
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.72
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.36
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1122000
CY2014	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	19947000
CY2014	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	-19000
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	126535000
CY2016Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	6333000
CY2015Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	7965000
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	28050000
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	26800000
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	79652000
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48472000
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	31180000
CY2014	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	559532000
CY2016	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	131805000
CY2016	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	124804000
CY2015	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	129876000
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	34735000
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	13479000
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	59906000
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	47111000
CY2016	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	3918000
CY2015	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	3953000
CY2014	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	5019000
CY2016	us-gaap	Interest Expense InterestExpense	572000
CY2015	us-gaap	Interest Expense InterestExpense	596000
CY2014	us-gaap	Interest Expense InterestExpense	677000
CY2016	us-gaap	Investment Income Nonoperating InvestmentIncomeNonoperating	5923000
CY2015	us-gaap	Investment Income Nonoperating InvestmentIncomeNonoperating	10337000
CY2014	us-gaap	Investment Income Nonoperating InvestmentIncomeNonoperating	7278000
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-651000
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1465000
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1175000
CY2016	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	3542000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	46895000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25708000
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11666000
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7062000
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15286000
CY2016	us-gaap	Net Income Loss NetIncomeLoss	35229000
CY2015	us-gaap	Net Income Loss NetIncomeLoss	18646000
CY2014	us-gaap	Net Income Loss NetIncomeLoss	44620000
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48724000
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	51145000
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48949000
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.36
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1528000
CY2014	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1773000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1862000
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4866000
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-569000
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-3724000
CY2014	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-4189000
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3219000
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8894000
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	32010000
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	604606000
CY2014	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2839000
CY2014	adtn	Stock Vested During Period Value Restricted Stock And Performance Stock Units StockVestedDuringPeriodValueRestrictedStockAndPerformanceStockUnits	326000
CY2014	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	80576000
CY2014	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	81000
CY2014	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8563000
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CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	18449000
CY2015	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	-7000
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CY2015	adtn	Stock Vested During Period Value Restricted Stock And Performance Stock Units StockVestedDuringPeriodValueRestrictedStockAndPerformanceStockUnits	69000
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	66160000
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CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	60000
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	283000
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CY2015	adtn	Stock Vested During Period Shares Restricted Stock And Performance Stock Units StockVestedDuringPeriodSharesRestrictedStockAndPerformanceStockUnits	34000
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CY2016	us-gaap	Investment Income Amortization Of Premium InvestmentIncomeAmortizationOfPremium	643000
CY2015	us-gaap	Investment Income Amortization Of Premium InvestmentIncomeAmortizationOfPremium	2402000
CY2014	us-gaap	Investment Income Amortization Of Premium InvestmentIncomeAmortizationOfPremium	4360000
CY2016	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-22000
CY2015	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-644000
CY2014	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-142000
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CY2014	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	63000
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CY2014	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	19298000
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	10887000
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	6877000
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-2144000
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	7108000
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	5070000
CY2014	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3818000
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	26722000
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-5826000
CY2014	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	9973000
CY2016	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	8792000
CY2015	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-10289000
CY2014	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-166000
CY2016	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-3162000
CY2015	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-11590000
CY2014	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	11168000
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	42000000
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	18547000
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	55837000
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	21441000
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11753000
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11256000
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	183000
CY2014Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2014Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	961000
CY2014	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2839000
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	25817000
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	66160000
CY2014	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	80576000
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	17583000
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18449000
CY2014	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1000
CY2016	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	225075000
CY2015	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	280435000
CY2014	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	230019000
CY2016	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	209172000
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	188921000
CY2014	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	142695000
CY2016	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	943000
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-6481000
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	79944000
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	76069000
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	4717000
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	19947000
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1100000
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1100000
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	16500000
CY2016	adtn	Tax Benefit Expense From Share Based Compensation Financing Activities TaxBenefitExpenseFromShareBasedCompensationFinancingActivities	-2000
CY2015	adtn	Tax Benefit Expense From Share Based Compensation Financing Activities TaxBenefitExpenseFromShareBasedCompensationFinancingActivities	-3000
CY2014	adtn	Tax Benefit Expense From Share Based Compensation Financing Activities TaxBenefitExpenseFromShareBasedCompensationFinancingActivities	-63000
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-39781000
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-84745000
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-114121000
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-4262000
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	13746000
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	17785000
CY2016	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-393000
CY2015	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-2635000
CY2014	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-2644000
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	73439000
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	58298000
CY2016	us-gaap	Interest Paid InterestPaid	575000
CY2015	us-gaap	Interest Paid InterestPaid	598000
CY2014	us-gaap	Interest Paid InterestPaid	758000
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	18689000
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	20139000
CY2014	us-gaap	Income Taxes Paid IncomeTaxesPaid	9856000
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	2103000
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	598000
CY2014	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	467000
CY2016	us-gaap	Use Of Estimates UseOfEstimates	<div> <p style="text-align:justify;margin-top:18pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-family:Times New Roman;font-size:10pt;font-style:normal;text-transform:none;font-variant: normal;">Use of Estimates</p> <p style="text-align:justify;margin-top:6pt;margin-bottom:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Our more significant estimates include the obsolete and excess inventory reserves, warranty reserves, customer rebates, determination of the deferred revenue components of multiple element sales agreements, estimated costs to complete obligations associated with deferred revenues and network installations, estimated income tax provision and income tax contingencies, the fair value of stock- based compensation, impairment of goodwill, valuation and estimated lives of intangible assets, estimated pension liability, fair value of investments, and the evaluation of other-than-temporary declines in the value of investments. Actual amounts could differ significantly from these estimates.</p></div>
CY2016	us-gaap	Revenue Recognition Deferred Revenue RevenueRecognitionDeferredRevenue	<div> <p style="text-align:justify;margin-top:18pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-family:Times New Roman;font-size:10pt;font-style:normal;text-transform:none;font-variant: normal;">Unearned Revenue</p> <p style="text-align:justify;margin-top:6pt;margin-bottom:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">Unearned revenue primarily represents customer billings on our maintenance service programs and unearned revenues relating to multiple element contracts where we still have contractual obligations to our customers. We currently offer maintenance contracts ranging from one to five years. Revenue attributable to maintenance contracts is recognized on a straight-line basis over the related contract term. In addition, we provide software maintenance and a variety of hardware maintenance services to customers under contracts with terms up to ten years. When we defer revenue related to multiple-element contracts where we still have contractual obligations, we also defer the related costs. Deferred costs are included in prepaid expenses and other assets and totaled $10.7 million and $5.2 million at December 31, 2016 and 2015, respectively.</p></div>
CY2014	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0
	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	10753000
CY2014	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-6692000
CY2014	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	4136000
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-75000
CY2015	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-2979000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1946000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	3043000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	1782000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	553000
CY2016Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8548000
CY2015Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8739000
CY2014Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8415000
CY2013Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8977000
CY2016	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	8561000
CY2016Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	77900000
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	27800000
CY2016Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	28100000
CY2016	adtn	Number Of Major Customers NumberOfMajorCustomers	3
CY2015	adtn	Number Of Major Customers NumberOfMajorCustomers	3
CY2016	us-gaap	Standard Product Warranty Description StandardProductWarrantyDescription	90 days to five years
CY2015	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	2998000
CY2014	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	3103000
CY2016	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	8752000
CY2015	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	2674000
CY2014	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	3665000
CY2016Q4	adtn	Number Of Stock Incentive Plans NumberOfStockIncentivePlans	2
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1	P3Y
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6695000
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6712000
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8563000
CY2016Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	16400000
CY2016	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y10M24D
CY2016	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0
CY2015	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0
CY2015	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	5915000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	1229000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	156000
CY2016	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-283000
CY2016	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	2936000
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	2484000
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	969000
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1515000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	4989000
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	2800000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	49000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	107000
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-569000
CY2016	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-4700000
CY2016	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1481000
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1384000
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-540000
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-844000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	10145000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	3957000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	6188000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-2303000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	-714000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-1589000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	396000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	123000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	273000
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-3724000
CY2015	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-12554000
CY2015	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3660000
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3874000
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1511000
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2363000
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	6780000
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	2644000
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	4136000
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	7052000
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	2186000
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	4866000
CY2014	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-4189000
CY2014	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-14147000
CY2014	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3319000
CY2016	adtn	Maximum Percentage Of Sales Tax Included In Sales MaximumPercentageOfSalesTaxIncludedInSales	0.01
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	17600000
CY2015	us-gaap	Payments Of Dividends PaymentsOfDividends	18400000
CY2014	us-gaap	Payments Of Dividends PaymentsOfDividends	19900000
CY2016Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2016Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2016Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2016Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2015Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2015Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2015Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2015Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2014Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2014Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.09
CY2016	us-gaap	Dividends Payable Date Declared Day Month And Year DividendsPayableDateDeclaredDayMonthAndYear	2017-01-17
CY2016	us-gaap	Dividends Payable Date Of Record Day Month And Year DividendsPayableDateOfRecordDayMonthAndYear	2017-02-02
CY2016	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2017-02-16
CY2016	adtn	Dividend Payable Ex Dividend Date Day Month And Year DividendPayableExDividendDateDayMonthAndYear	2017-01-31
CY2016	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	641170000
CY2015	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	603923000
CY2016	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	31212000
CY2015	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	22945000
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	963000
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	862000
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1157000
CY2015	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5850000
CY2014	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7406000
CY2016	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5732000
CY2015Q4	us-gaap	Restricted Investments RestrictedInvestments	30000000
CY2015Q4	us-gaap	Other Investments OtherInvestments	1289000
CY2016	adtn	Estimated Forfeitures For Stock Options And Restricted Stock Units EstimatedForfeituresForStockOptionsAndRestrictedStockUnits	0.037
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7108000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	19000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	93000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	413000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	6338000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	6276000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	4757000
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.97
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	18.24
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	16.66
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	17.90
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	23.96
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.14
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	22.20
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	23.67
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P6Y5M1D
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y7M17D
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P5Y7M6D
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P4Y8M23D
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	3284000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	16972000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	16606000
CY2016Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	9137000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5600000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1100000
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	100000
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	700000
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	5700000
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	6600000
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	7700000
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	106000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	460000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	46000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	1000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	519000
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	21.09
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	20.63
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	22.50
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	20.00
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	20.51
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	5.22
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	4.28
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	6.31
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2016Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	190146000
CY2016Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2709000
CY2016Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2132000
CY2016Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	190723000
CY2016Q4	us-gaap	Restricted Investments RestrictedInvestments	27800000
CY2016Q4	us-gaap	Other Investments OtherInvestments	767000
CY2016Q4	us-gaap	Investments Investments	219290000
CY2015Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	198100000
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5927000
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2894000
CY2015Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	201133000
CY2015Q4	us-gaap	Investments Investments	232422000
CY2016	us-gaap	Threshold Percentage Of Value Decline In Equity Securities To Be Considered Other Than Temporary Impairment ThresholdPercentageOfValueDeclineInEquitySecuritiesToBeConsideredOtherThanTemporaryImpairment	0.25
CY2016	us-gaap	Impairment Of Investments ImpairmentOfInvestments	800000
CY2015	us-gaap	Impairment Of Investments ImpairmentOfInvestments	200000
CY2014	us-gaap	Impairment Of Investments ImpairmentOfInvestments	100000
CY2016	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	7530000
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	10906000
CY2014	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	7586000
CY2016	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	1607000
CY2015	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	569000
CY2014	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	308000
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	101600000
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1781000
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	5701000
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	351000
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	107301000
CY2016Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	2132000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	128189000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2584000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	3508000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	310000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	131697000
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	2894000
CY2016	adtn	Number Of Marketable Equity Securities Subjected To Impairment Test NumberOfMarketableEquitySecuritiesSubjectedToImpairmentTest	293
CY2016Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	40461000
CY2015Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	34223000
CY2016Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	4003000
CY2015Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	2893000
CY2016Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	60653000
CY2015Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	54417000
CY2016Q4	us-gaap	Land Land	4575000
CY2015Q4	us-gaap	Land Land	4575000
CY2016Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	29229000
CY2015Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	25667000
CY2016Q4	adtn	Building Building	68301000
CY2015Q4	adtn	Building Building	68301000
CY2016Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	18477000
CY2015Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	17347000
CY2016Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	87655000
CY2015Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	76389000
CY2016Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	118746000
CY2015Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	112132000
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	326983000
CY2015Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	304411000
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	242514000
CY2015Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	231178000
CY2016	us-gaap	Depreciation Depreciation	12000000
CY2015	us-gaap	Depreciation Depreciation	12300000
CY2014	us-gaap	Depreciation Depreciation	12500000
CY2016	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2016Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	18653000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11386000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7267000
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2015Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	14169000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	9086000
CY2015Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5083000
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2500000
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1900000
CY2014	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2300000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2867000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1168000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	655000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	621000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	568000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	1388000
CY1995Q1	us-gaap	Long Term Debt LongTermDebt	20000000
CY2008Q4	us-gaap	Long Term Debt LongTermDebt	50000000
CY2016Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.02
CY2016	us-gaap	Debt Instrument Maturity Date DebtInstrumentMaturityDate	2020-01-01
CY2016	adtn	Realized Economic Incentives RealizedEconomicIncentives	1300000
CY2015	adtn	Realized Economic Incentives RealizedEconomicIncentives	1300000
CY2014	adtn	Realized Economic Incentives RealizedEconomicIncentives	1300000
CY2016Q4	us-gaap	Debt Current DebtCurrent	1000000
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	12733000
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	7504000
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	7626000
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1141000
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	279000
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	599000
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	477000
CY2015	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	-29000
CY2014	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	12587000
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	14351000
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7754000
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	20812000
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	647000
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-585000
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1083000
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	73000
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-66000
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-123000
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-3405000
CY2015	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-41000
CY2014	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-4320000
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0393
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0486
CY2014	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0269
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.0815
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.1255
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.0405
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.0034
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.0210
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.0726
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0053
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0194
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0125
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.0253
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0277
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0504
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0221
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.0223
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.0691
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.0306
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.0317
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.0115
CY2016	adtn	Effective Income Tax Rate Reconciliation Bargain Purchase EffectiveIncomeTaxRateReconciliationBargainPurchase	0.0264
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0008
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0130
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0069
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2488
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2747
CY2014	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2552
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	54077000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	27400000
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	23812000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-7182000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-1692000
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	36094000
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	7000
CY2016Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	12020000
CY2015Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	12558000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	5551000
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	6359000
CY2016Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1062000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	5751000
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	5072000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	4724000
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	4704000
CY2016Q4	adtn	Deferred Tax Assets State Tax And Interest Expense Non Current DeferredTaxAssetsStateTaxAndInterestExpenseNonCurrent	762000
CY2015Q4	adtn	Deferred Tax Assets State Tax And Interest Expense Non Current DeferredTaxAssetsStateTaxAndInterestExpenseNonCurrent	1026000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	4273000
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	5729000
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	6486000
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	5389000
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4021000
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4187000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	5886000
CY2015Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	5886000
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance Noncurrent DeferredTaxAssetsValuationAllowanceNoncurrent	6149000
CY2015Q4	us-gaap	Deferred Tax Assets Valuation Allowance Noncurrent DeferredTaxAssetsValuationAllowanceNoncurrent	7250000
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	44387000
CY2015Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	43667000
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4433000
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3315000
CY2015Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Reserves And Accruals DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals	2791000
CY2016Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	1918000
CY2015Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	476000
CY2015Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	70000
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6351000
CY2015Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6652000
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	38036000
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	37015000
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	1500000
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3700000
CY2016Q4	adtn	Deferred Tax Assets Foreign And Domestic Loss Unamortized Research And Development Cost And State Credit Carry Forwards Non Current DeferredTaxAssetsForeignAndDomesticLossUnamortizedResearchAndDevelopmentCostAndStateCreditCarryForwardsNonCurrent	16400000
CY2014	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1189000
CY2016	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	1100000
CY2016Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	123100000
CY2015Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	118900000
CY2015	us-gaap	Income Tax Effects Allocated Directly To Equity Employee Stock Options IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions	40000
CY2014	us-gaap	Income Tax Effects Allocated Directly To Equity Employee Stock Options IncomeTaxEffectsAllocatedDirectlyToEquityEmployeeStockOptions	-100000
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2537000
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3334000
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3240000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	95000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	428000
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	280000
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	522000
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	29000
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	103000
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	834000
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	945000
CY2014	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	428000
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2226000
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1700000
CY2015Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1800000
CY2014Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2600000
CY2016Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	800000
CY2015Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	900000
CY2014Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	1000000
CY2015Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	26851000
CY2014Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	30507000
CY2016	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1211000
CY2015	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1314000
CY2016	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	720000
CY2015	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	615000
CY2016	adtn	Defined Benefit Plan Actuarial Gain Loss Experience DefinedBenefitPlanActuarialGainLossExperience	431000
CY2015	adtn	Defined Benefit Plan Actuarial Gain Loss Experience DefinedBenefitPlanActuarialGainLossExperience	247000
CY2016	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-2628000
CY2015	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	2078000
CY2016	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	52000
CY2015	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	81000
CY2016	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	-916000
CY2015	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	-3179000
CY2016Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	30011000
CY2015Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	19213000
CY2014Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	20338000
CY2016	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	1494000
CY2015	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	988000
CY2016	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Plan Assets DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets	-662000
CY2015	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Plan Assets DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets	-2113000
CY2016Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	20045000
CY2016Q4	adtn	Defined Benefit Plan Funded And Unfunded Status Of Plan DefinedBenefitPlanFundedAndUnfundedStatusOfPlan	-9966000
CY2015Q4	adtn	Defined Benefit Plan Funded And Unfunded Status Of Plan DefinedBenefitPlanFundedAndUnfundedStatusOfPlan	-7638000
CY2016Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	28700000
CY2015Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	25100000
CY2016Q4	us-gaap	Defined Benefit Pension Plan Liabilities Current DefinedBenefitPensionPlanLiabilitiesCurrent	0
CY2015Q4	us-gaap	Defined Benefit Pension Plan Liabilities Current DefinedBenefitPensionPlanLiabilitiesCurrent	0
CY2016Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	9966000
CY2015Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	7638000
CY2016Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	9966000
CY2015Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	7638000
CY2015Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	12834000
CY2016	adtn	Deferred Compensation Adjustments Due To Fair Value Of Trust Assets DeferredCompensationAdjustmentsDueToFairValueOfTrustAssets	-1300000
CY2014	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	836000
CY2016	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1057000
CY2015	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1011000
CY2014	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1086000
CY2016	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-175000
CY2015	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-407000
CY2016	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1049000
CY2015	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1325000
CY2014	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	939000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-156000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-396000
CY2016	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-1626000
CY2015	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	2699000
CY2014	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-7052000
CY2016	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	2675000
CY2015	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	-1374000
CY2014	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	7991000
CY2016Q4	adtn	Defined Benefit Plan Accumulated Other Comprehensive Income Net Actuarial Gains Losses Net Of Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetActuarialGainsLossesNetOfTax	-6871000
CY2015Q4	adtn	Defined Benefit Plan Accumulated Other Comprehensive Income Net Actuarial Gains Losses Net Of Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetActuarialGainsLossesNetOfTax	-5245000
CY2016	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0264
CY2015	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0220
CY2014	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0370
CY2016	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.0200
CY2015	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.0225
CY2014	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.0225
CY2016	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0540
CY2015	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0540
CY2014	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0540
CY2016Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0190
CY2015Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0264
CY2016Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0200
CY2015Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0225
CY2016	us-gaap	Defined Benefit Plan Future Amortization Of Gain Loss DefinedBenefitPlanFutureAmortizationOfGainLoss	300000
CY2016Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	348000
CY2016Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	515000
CY2016Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	699000
CY2016Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	964000
CY2016Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	1079000
CY2016Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	5156000
CY2016Q4	adtn	Defined Benefit Plan Expected Future Benefit Payments DefinedBenefitPlanExpectedFutureBenefitPayments	8761000
CY2016	adtn	Criteria Of Employer To Contribute In Employee Saving Plan CriteriaOfEmployerToContributeInEmployeeSavingPlan	100% of an employee’s first 3% of contributions and 50% of their next 2% of contributions
CY2016	adtn	Defined Contribution Plan Employer Matching First Contribution Percent Of Match DefinedContributionPlanEmployerMatchingFirstContributionPercentOfMatch	1.00
CY2016	adtn	Defined Contribution Plan Employer Matching Second Contribution Percent Of Match DefinedContributionPlanEmployerMatchingSecondContributionPercentOfMatch	0.50
CY2016	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2016	adtn	Maximum Statutory Compensation Eligible For Match Under Code MaximumStatutoryCompensationEligibleForMatchUnderCode	265000
CY2016	us-gaap	Defined Contribution Plan Employers Matching Contribution Annual Vesting Percentage DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage	1.00
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4100000
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4700000
CY2014	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4500000
CY2016	adtn	Number Of Deferred Compensation Programs NumberOfDeferredCompensationPrograms	4
CY2016	adtn	Maximum Percentage Of Cash Compensation Allowed To Be Deferred Under Deferred Compensation Plan MaximumPercentageOfCashCompensationAllowedToBeDeferredUnderDeferredCompensationPlan	0.25
CY2016	adtn	Criteria For Benefit Distribution CriteriaForBenefitDistribution	Six months after termination of employment in a single lump sum payment or annual installments paid over a three or ten year term.
CY2016Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	14596000
CY2015Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	12834000
CY2016Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	14596000
CY2015	adtn	Deferred Compensation Adjustments Due To Fair Value Of Trust Assets DeferredCompensationAdjustmentsDueToFairValueOfTrustAssets	300000
CY2014	adtn	Deferred Compensation Adjustments Due To Fair Value Of Trust Assets DeferredCompensationAdjustmentsDueToFairValueOfTrustAssets	-700000
CY2016	adtn	Maximum Period Of Medical Dental And Prescription Drug Coverage MaximumPeriodOfMedicalDentalAndPrescriptionDrugCoverage	P30Y
CY2016Q4	us-gaap	Deferred Compensation Arrangement With Individual Recorded Liability DeferredCompensationArrangementWithIndividualRecordedLiability	200000
CY2015Q4	us-gaap	Deferred Compensation Arrangement With Individual Recorded Liability DeferredCompensationArrangementWithIndividualRecordedLiability	200000
CY2016	adtn	Number Of Product Categories NumberOfProductCategories	3
CY2016	adtn	Number Of Single Customers Accounting For More Than Ten Percent Of Annual Revenues NumberOfSingleCustomersAccountingForMoreThanTenPercentOfAnnualRevenues	3
CY2015	adtn	Number Of Single Customers Accounting For More Than Ten Percent Of Annual Revenues NumberOfSingleCustomersAccountingForMoreThanTenPercentOfAnnualRevenues	3
CY2014	adtn	Number Of Single Customers Accounting For More Than Ten Percent Of Annual Revenues NumberOfSingleCustomersAccountingForMoreThanTenPercentOfAnnualRevenues	2
CY2016Q4	us-gaap	Noncurrent Assets NoncurrentAssets	84500000
CY2015Q4	us-gaap	Noncurrent Assets NoncurrentAssets	73200000
CY2016Q4	adtn	Number Of Private Equity Funds NumberOfPrivateEquityFunds	2
CY2016Q4	adtn	Commitments Towards Private Equity Funds CommitmentsTowardsPrivateEquityFunds	7700000
CY2016	adtn	Operating Lease Expiration Year OperatingLeaseExpirationYear	2025
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	3788000
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	2043000
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	847000
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	741000
CY2016Q4	adtn	Operating Leases Future Minimum Payments Due In Year Five And Thereafter OperatingLeasesFutureMinimumPaymentsDueInYearFiveAndThereafter	3243000
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	10662000
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	4200000
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	4900000
CY2014	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	4700000
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	170000
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	81000
CY2014	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	304000
CY2016	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	55000
CY2015	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	41000
CY2014	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	58000
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4600000
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	6100000
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4400000
CY2016Q1	us-gaap	Sales Revenue Net SalesRevenueNet	142204000
CY2016Q2	us-gaap	Sales Revenue Net SalesRevenueNet	162701000
CY2016Q3	us-gaap	Sales Revenue Net SalesRevenueNet	168890000
CY2016Q4	us-gaap	Sales Revenue Net SalesRevenueNet	162986000
CY2016Q1	us-gaap	Gross Profit GrossProfit	65794000
CY2016Q2	us-gaap	Gross Profit GrossProfit	78955000
CY2016Q3	us-gaap	Gross Profit GrossProfit	75808000
CY2016Q4	us-gaap	Gross Profit GrossProfit	70787000
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	5521000
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	14812000
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	10130000
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	4272000
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	5014000
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	10228000
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	12415000
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	7572000
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2015Q1	us-gaap	Sales Revenue Net SalesRevenueNet	142835000
CY2015Q2	us-gaap	Sales Revenue Net SalesRevenueNet	160138000
CY2015Q3	us-gaap	Sales Revenue Net SalesRevenueNet	158078000
CY2015Q4	us-gaap	Sales Revenue Net SalesRevenueNet	139013000
CY2015Q1	us-gaap	Gross Profit GrossProfit	65563000
CY2015Q2	us-gaap	Gross Profit GrossProfit	68246000
CY2015Q3	us-gaap	Gross Profit GrossProfit	70649000
CY2015Q4	us-gaap	Gross Profit GrossProfit	62439000
CY2015Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	1963000
CY2015Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	644000
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	8072000
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.12
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	3317000
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	2544000
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	7067000
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	5718000
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.05
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.14
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.12
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.05

Files In Submission

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0001564590-17-002423-index-headers.html	Edgar Link	pending
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0001564590-17-002423.txt	Edgar Link	pending
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adtn-10k_20161231.htm	Edgar Link	pending
adtn-20161231.xml	Edgar Link	completed
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adtn-20161231_cal.xml	Edgar Link	unprocessable
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$ADTN
ADTRAN Holdings, Inc. Stock $adtn

2016 Q4 Form 10-K Financial Statement

#000156459017002423 Filed on February 24, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ADTN ADTRAN Holdings, Inc. Stock $adtn

2016 Q4 Form 10-K Financial Statement

#000156459017002423 Filed on February 24, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ADTN
ADTRAN Holdings, Inc. Stock $adtn