$CCOI
COGENT COMMUNICATIONS HOLDINGS, INC. Stock $ccoi

$ccoi Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000141057824000091 Filed on February 29, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023 Q3
Revenue	$266.2M	$272.1M	$275.4M
YoY Change	73.3%	79.04%	83.62%
Cost Of Revenue	$168.9M	$174.5M	$173.6M
YoY Change	188.09%	206.29%	203.38%
Gross Profit	$97.24M	$97.60M	$101.8M
YoY Change	2.41%	2.73%	9.76%
Gross Profit Margin	36.53%	35.87%	36.97%
Selling, General & Admin	$76.70M	$81.27M	$65.31M
YoY Change	70.14%	85.16%	66.97%
% of Gross Profit	78.88%	83.27%	64.13%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$70.89M	$67.81M	$86.73M
YoY Change	181.31%	187.76%	278.75%
% of Gross Profit	72.91%	69.47%	85.17%
Operating Expenses	$76.70M	$149.1M	$65.31M
YoY Change	70.14%	121.0%	66.97%
Operating Profit	-$59.39M	-$51.48M	-$50.56M
YoY Change	-344.28%	-286.83%	-279.95%
Interest Expense	$23.01M	-$5.783M	$24.20M
YoY Change	21.07%	-62.69%	34.82%
% of Operating Profit
Other Income/Expense, Net	$2.737M	-$254.0M	$1.604M
YoY Change	-21.76%		-712.21%
Pretax Income	-$84.43M	$179.8M	-$70.35M
YoY Change	-892.66%	1395.86%	899.52%
Income Tax	-$19.13M	-$20.86M	-$13.62M
% Of Pretax Income		-11.6%
Net Earnings	-$65.31M	$200.2M	-$56.70M
YoY Change	-1162.25%	23392.14%	608.13%
Net Earnings / Revenue	-24.54%	73.56%	-20.59%
Basic Earnings Per Share	-$1.38		-$1.20
Diluted Earnings Per Share	-$1.38	$4.14	-$1.20
COMMON SHARES
Basic Shares Outstanding	47.43M	48.62M	48.88M
Diluted Shares Outstanding	47.42M		47.23M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$118.4M	$75.09M	$109.7M
YoY Change	-35.68%	-66.44%	-59.21%
Cash & Equivalents	$118.4M	$75.09M	$109.7M
Short-Term Investments
Other Short-Term Assets	$124.5M	$119.3M	$129.9M
YoY Change	25.18%	21.7%	28.45%
Inventory
Prepaid Expenses
Receivables	$107.2M	$135.5M	$87.17M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$473.2M	$513.6M	$581.3M
YoY Change	43.91%	40.37%	40.57%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.561B	$1.538B	$1.618B
YoY Change	172.95%	182.46%	221.11%
Goodwill
YoY Change
Intangibles		$472.8M	$54.36M
YoY Change
Long-Term Investments
YoY Change
Other Assets	$26.33M	$23.44M	$22.10M
YoY Change	45.05%	28.51%	27.1%
Total Long-Term Assets	$2.672B	$2.698B	$2.380B
YoY Change	299.07%	318.77%	292.04%
TOTAL ASSETS
Total Short-Term Assets	$473.2M	$513.6M	$581.3M
Total Long-Term Assets	$2.672B	$2.698B	$2.380B
Total Assets	$3.145B	$3.212B	$2.962B
YoY Change	215.04%	217.92%	190.16%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$45.93M	$48.36M	$29.37M
YoY Change	148.27%	77.73%	59.62%
Accrued Expenses	$187.5M	$120.5M	$120.0M
YoY Change	144.23%	88.64%	78.38%
Deferred Revenue
YoY Change
Short-Term Debt	$10.80M	$71.89M	$74.60M
YoY Change
Long-Term Debt Due	$64.04M	$64.59M	$63.20M
YoY Change	223.74%	275.94%	161.86%
Total Short-Term Liabilities	$420.6M	$373.3M	$355.7M
YoY Change	230.09%	210.37%	192.47%
LONG-TERM LIABILITIES
Long-Term Debt	$1.399B	$1.366B	$1.365B
YoY Change	12.38%	10.9%	13.04%
Other Long-Term Liabilities	$67.36M	$61.64M	$79.44M
YoY Change	-18.29%	-25.41%	-5.13%
Total Long-Term Liabilities	$67.36M	$61.64M	$79.44M
YoY Change	-18.29%	-25.41%	-5.13%
TOTAL LIABILITIES
Total Short-Term Liabilities	$420.6M	$373.3M	$355.7M
Total Long-Term Liabilities	$67.36M	$61.64M	$79.44M
Total Liabilities	$2.645B	$2.602B	$2.520B
YoY Change	70.97%	70.2%	66.59%
SHAREHOLDERS EQUITY
Retained Earnings	-$94.52M	$17.14M	-$136.7M
YoY Change	-91.51%	-101.59%	-86.75%
Common Stock	$614.6M	$606.8M	$598.5M
YoY Change	5.49%	5.51%	5.36%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$500.6M	$609.6M	$442.1M
YoY Change
Total Liabilities & Shareholders Equity	$3.145B	$3.212B	$2.962B
YoY Change	215.04%	217.92%	190.16%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023 Q3
OPERATING ACTIVITIES
Net Income	-$65.31M	$200.2M	-$56.70M
YoY Change	-1162.25%	23392.14%	608.13%
Depreciation, Depletion And Amortization	$70.89M	$67.81M	$86.73M
YoY Change	181.31%	187.76%	278.75%
Cash From Operating Activities	$19.22M	-$48.70M	-$52.50M
YoY Change	-46.35%	-234.07%	-198.0%
INVESTING ACTIVITIES
Capital Expenditures	$40.88M	$43.61M	$25.30M
YoY Change	76.19%	122.6%	-205.54%
Acquisitions
YoY Change
Other Investing Activities	$91.83M	$103.7M	$87.50M
YoY Change
Cash From Investing Activities	$50.95M	$60.12M	$62.10M
YoY Change	-319.58%	-406.87%	-359.06%
FINANCING ACTIVITIES
Cash Dividend Paid	$478.0K
YoY Change	-98.95%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-23.55M	-64.73M	-86.00M
YoY Change	-56.88%	-5.22%	63.82%
NET CHANGE
Cash From Operating Activities	19.22M	-48.70M	-52.50M
Cash From Investing Activities	50.95M	60.12M	62.10M
Cash From Financing Activities	-23.55M	-64.73M	-86.00M
Net Change In Cash	49.49M	-53.31M	-76.40M
YoY Change	-219.29%	3.38%	233.67%
FREE CASH FLOW
Cash From Operating Activities	$19.22M	-$48.70M	-$52.50M
Capital Expenditures	$40.88M	$43.61M	$25.30M
Free Cash Flow	-$21.66M	-$92.31M	-$77.80M
YoY Change	-271.7%	-651.68%	-200.33%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001158324
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Entity Address Country EntityAddressCountry	US
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	48013330
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48608569
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	000-51829
CY2023	dei	Entity Registrant Name EntityRegistrantName	COGENT COMMUNICATIONS HOLDINGS, INC.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	46-5706863
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	2450 N Street N.W.
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Washington, D.C
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	20037
CY2023	dei	City Area Code CityAreaCode	(202)
CY2023	dei	Local Phone Number LocalPhoneNumber	295-4200
CY2023	dei	Security12b Title Security12bTitle	Common Stock, par value $0.001 per share
CY2023	dei	Trading Symbol TradingSymbol	CCOI
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	2900000000
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	47425367
CY2023	dei	Auditor Firm AuditorFirmId	42
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Location AuditorLocation	Tysons, VA
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	75092000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	223783000
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	38689000
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	52129000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3677000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2303000
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	135475000
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	44123000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Current Amount Of Discount BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementCurrentAmountOfDiscount	24898000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Net Of Discount Current BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementNetOfDiscountCurrent	179269000
CY2023Q4	ccoi	Related Party Transaction Due Transition Services Between Related Party Current RelatedPartyTransactionDueTransitionServicesBetweenRelatedPartyCurrent	4514000
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	80588000
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	45878000
CY2023Q4	us-gaap	Assets Current AssetsCurrent	513627000
CY2022Q4	us-gaap	Assets Current AssetsCurrent	365913000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2947376000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1714906000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1409559000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1170476000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1537817000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	544430000
CY2023Q4	ccoi	Lease Right Of Use Asset LeaseRightOfUseAsset	361587000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Purchase Agreement Net Of Discount Noncurrent BusinessCombinationAmountDueFromSellerUnderPurchaseAgreementNetOfDiscountNoncurrent	38585000
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2023	dei	City Area Code CityAreaCode	(202)
CY2023	dei	Local Phone Number LocalPhoneNumber	295-4200
CY2023	dei	Security12b Title Security12bTitle	Common Stock, par value $0.001 per share
CY2023	dei	Trading Symbol TradingSymbol	CCOI
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	2900000000
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	47425367
CY2023	dei	Auditor Firm AuditorFirmId	42
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Location AuditorLocation	Tysons, VA
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	75092000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	223783000
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	38689000
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	52129000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3677000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2303000
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	135475000
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	44123000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Current Amount Of Discount BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementCurrentAmountOfDiscount	24898000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Net Of Discount Current BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementNetOfDiscountCurrent	179269000
CY2023Q4	ccoi	Related Party Transaction Due Transition Services Between Related Party Current RelatedPartyTransactionDueTransitionServicesBetweenRelatedPartyCurrent	4514000
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	80588000
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	45878000
CY2023Q4	us-gaap	Assets Current AssetsCurrent	513627000
CY2022Q4	us-gaap	Assets Current AssetsCurrent	365913000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2947376000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1714906000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1409559000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1170476000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1537817000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	544430000
CY2023Q4	ccoi	Lease Right Of Use Asset LeaseRightOfUseAsset	361587000
CY2022Q4	ccoi	Lease Right Of Use Asset LeaseRightOfUseAsset	81601000
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	472815000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Noncurrent Amount Of Discount BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementNoncurrentAmountOfDiscount	27916000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Net Of Discount Noncurrent BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementNetOfDiscountNoncurrent	263750000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Purchase Agreement Noncurrent Amount Of Discount BusinessCombinationAmountDueFromSellerUnderPurchaseAgreementNoncurrentAmountOfDiscount	13725000
CY2023Q4	ccoi	Business Combination Amount Due From Seller Under Purchase Agreement Net Of Discount Noncurrent BusinessCombinationAmountDueFromSellerUnderPurchaseAgreementNetOfDiscountNoncurrent	38585000
CY2023Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	23438000
CY2022Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	18238000
CY2023Q4	us-gaap	Assets Assets	3211619000
CY2022Q4	us-gaap	Assets Assets	1010182000
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CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	27208000
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	120523000
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	63889000
CY2023Q4	ccoi	Business Combination Amount Due To Seller Under Ip Transit Services Agreement Current BusinessCombinationAmountDueToSellerUnderIpTransitServicesAgreementCurrent	66908000
CY2023Q4	ccoi	Business Combination Amount Due To Seller Under Purchase Agreement Current BusinessCombinationAmountDueToSellerUnderPurchaseAgreementCurrent	4981000
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	67962000
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	12005000
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	64594000
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	17182000
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	373324000
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	120284000
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	330095000
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	94587000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	419921000
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CY2022Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	18238000
CY2023Q4	us-gaap	Assets Assets	3211619000
CY2022Q4	us-gaap	Assets Assets	1010182000
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CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	67962000
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	64594000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	419921000
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CY2023Q4	us-gaap	Liabilities Liabilities	2602063000
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CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
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CY2023Q4	us-gaap	Common Stock Value CommonStockValue	49000
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	48000
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	606755000
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CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-14385000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-19156000
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	17137000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	609556000
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CY2023Q4	us-gaap	Common Stock Value CommonStockValue	49000
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	48000
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	606755000
CY2022Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	575064000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-14385000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-19156000
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	17137000
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-1074588000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	609556000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	-518632000
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3211619000
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1010182000
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	940922000
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	599604000
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	589797000
CY2023	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	544232000
CY2022	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	228154000
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	226337000
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	275318000
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	163021000
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	162380000
CY2023	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	18492000
CY2022	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2248000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92222000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	89240000
CY2023	us-gaap	Costs And Expenses CostsAndExpenses	1070251000
CY2022	us-gaap	Costs And Expenses CostsAndExpenses	485645000
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	477957000
CY2021	ccoi	Gains Losses On Lease Terminations GainsLossesOnLeaseTerminations	7393000
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	-129329000
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	113959000
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	119233000
CY2023	us-gaap	Interest Expense InterestExpense	106783000
CY2022	us-gaap	Interest Expense InterestExpense	67584000
CY2021	us-gaap	Interest Expense InterestExpense	58059000
CY2023	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	13439000
CY2022	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-43113000
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-9015000
CY2022	ccoi	Foreign Currency Transaction Gain Loss Unrealized On2024 Euro Notes ForeignCurrencyTransactionGainLossUnrealizedOn2024EuroNotes	31561000
CY2021	ccoi	Foreign Currency Transaction Gain Loss Unrealized On2024 Euro Notes ForeignCurrencyTransactionGainLossUnrealizedOn2024EuroNotes	32522000
CY2023	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	1406435000
CY2023	ccoi	Interest Income Expense Nonoperating Internet Protocol Transit Agreement InterestIncomeExpenseNonoperatingInternetProtocolTransitAgreement	26796000
CY2023	ccoi	Interest Income Expense Nonoperating Purchase Agreement InterestIncomeExpenseNonoperatingPurchaseAgreement	1889000
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	599604000
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	589797000
CY2023	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	544232000
CY2022	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	228154000
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	226337000
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	275318000
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	163021000
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	162380000
CY2023	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	18492000
CY2022	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2248000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92222000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	89240000
CY2023	us-gaap	Costs And Expenses CostsAndExpenses	1070251000
CY2022	us-gaap	Costs And Expenses CostsAndExpenses	485645000
CY2021	ccoi	Gains Losses On Lease Terminations GainsLossesOnLeaseTerminations	7393000
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	113959000
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	119233000
CY2023	us-gaap	Interest Expense InterestExpense	106783000
CY2022	us-gaap	Interest Expense InterestExpense	67584000
CY2021	us-gaap	Interest Expense InterestExpense	58059000
CY2023	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	13439000
CY2022	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-43113000
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-9015000
CY2022	ccoi	Foreign Currency Transaction Gain Loss Unrealized On2024 Euro Notes ForeignCurrencyTransactionGainLossUnrealizedOn2024EuroNotes	31561000
CY2021	ccoi	Foreign Currency Transaction Gain Loss Unrealized On2024 Euro Notes ForeignCurrencyTransactionGainLossUnrealizedOn2024EuroNotes	32522000
CY2023	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	1406435000
CY2023	ccoi	Interest Income Expense Nonoperating Internet Protocol Transit Agreement InterestIncomeExpenseNonoperatingInternetProtocolTransitAgreement	26796000
CY2023	ccoi	Interest Income Expense Nonoperating Purchase Agreement InterestIncomeExpenseNonoperatingPurchaseAgreement	1889000
CY2023	us-gaap	Interest And Other Income InterestAndOtherIncome	7030000
CY2022	us-gaap	Interest And Other Income InterestAndOtherIncome	3438000
CY2021	us-gaap	Interest And Other Income InterestAndOtherIncome	1437000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1219477000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	26376000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	71420000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-53964000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21230000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23235000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1273441000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5146000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48185000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1273441000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5146000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48185000
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-8153000
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-9697000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1278213000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-3007000
CY2023	us-gaap	Interest And Other Income InterestAndOtherIncome	7030000
CY2022	us-gaap	Interest And Other Income InterestAndOtherIncome	3438000
CY2021	us-gaap	Interest And Other Income InterestAndOtherIncome	1437000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1219477000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	26376000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	71420000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-53964000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21230000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23235000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1273441000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5146000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48185000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1273441000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5146000
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-8153000
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-9697000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1278213000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-3007000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	38488000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	26.88
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	26.62
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.760
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.555
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.170
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47373361
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46875992
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46419180
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47837512
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47207298
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46963920
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	-293166000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30044000
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-9697000
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1823000
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	150288000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48185000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	-373098000
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	26716000
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-8153000
CY2022	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	614000
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	169857000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5146000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	-518632000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	38488000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	26.88
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.760
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.555
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47373361
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46875992
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46419180
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47837512
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47207298
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46963920
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	-293166000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30044000
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-9697000
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1823000
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	150288000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	-373098000
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	26716000
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-8153000
CY2022	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	614000
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	169857000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5146000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	-518632000
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30464000
CY2023	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000
CY2023	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1227000
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	181716000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1273441000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	609556000
CY2023	us-gaap	Profit Loss ProfitLoss	1273441000
CY2022	us-gaap	Profit Loss ProfitLoss	5146000
CY2021	us-gaap	Profit Loss ProfitLoss	48185000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92222000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	89240000
CY2023	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1323000
CY2022	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1464000
CY2021	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1759000
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	26924000
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	24439000
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	26822000
CY2023	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	1406435000
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	31561000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	32522000
CY2022	ccoi	Loss On Debt Extinguishment And Redemption2024 Notes LossOnDebtExtinguishmentAndRedemption2024Notes	11885000
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30464000
CY2023	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000
CY2023	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1227000
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	181716000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1273441000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	609556000
CY2023	us-gaap	Profit Loss ProfitLoss	1273441000
CY2022	us-gaap	Profit Loss ProfitLoss	5146000
CY2021	us-gaap	Profit Loss ProfitLoss	48185000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92222000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	89240000
CY2023	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1323000
CY2022	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1464000
CY2021	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1759000
CY2023	ccoi	Business Combination Amortization Of Discount On Amount Due From Seller BusinessCombinationAmortizationOfDiscountOnAmountDueFromSeller	-28685000
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	26924000
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	24439000
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	26822000
CY2023	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	1406435000
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	31561000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	32522000
CY2022	ccoi	Loss On Debt Extinguishment And Redemption2024 Notes LossOnDebtExtinguishmentAndRedemption2024Notes	11885000
CY2021	ccoi	Loss On Debt Extinguishment And Redemption2022 Notes LossOnDebtExtinguishmentAndRedemption2022Notes	14698000
CY2021	ccoi	Gain Lease Termination GainLeaseTermination	7375000
CY2023	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-212000
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-69000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-69582000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	16539000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18159000
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	51002000
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	2838000
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-1385000
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	11001000
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	7427000
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	17000
CY2023	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	13439000
CY2022	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-43113000
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-9015000
CY2023	ccoi	Increase Decrease In Business Combination Amount Due To Seller Under Ip Transit Services Agreement IncreaseDecreaseInBusinessCombinationAmountDueToSellerUnderIpTransitServicesAgreement	66908000
CY2023	ccoi	Increase Decrease In Due From Related Parties Current Transition Services IncreaseDecreaseInDueFromRelatedPartiesCurrentTransitionServices	4514000
CY2023	ccoi	Increase Decrease In Contract With Customer Refund Liability IncreaseDecreaseInContractWithCustomerRefundLiability	-1548000
CY2022	ccoi	Increase Decrease In Contract With Customer Refund Liability IncreaseDecreaseInContractWithCustomerRefundLiability	-282000
CY2021	ccoi	Increase Decrease In Contract With Customer Refund Liability IncreaseDecreaseInContractWithCustomerRefundLiability	-12000
CY2023	ccoi	Increase Decrease In Unfavorable Lease Liabilities IncreaseDecreaseInUnfavorableLeaseLiabilities	-26511000
CY2023	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	29045000
CY2022	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	20635000
CY2021	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	851000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	17345000
CY2021	ccoi	Loss On Debt Extinguishment And Redemption2022 Notes LossOnDebtExtinguishmentAndRedemption2022Notes	14698000
CY2021	ccoi	Gain Lease Termination GainLeaseTermination	7375000
CY2023	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-212000
CY2022	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-372000
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-69000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-69582000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	16539000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18159000
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	51002000
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	2838000
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-1385000
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	11001000
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	7427000
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	17000
CY2023	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	13439000
CY2022	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-43113000
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-9015000
CY2023	ccoi	Increase Decrease In Business Combination Amount Due To Seller Under Ip Transit Services Agreement IncreaseDecreaseInBusinessCombinationAmountDueToSellerUnderIpTransitServicesAgreement	66908000
CY2023	ccoi	Increase Decrease In Due From Related Parties Current Transition Services IncreaseDecreaseInDueFromRelatedPartiesCurrentTransitionServices	4514000
CY2023	ccoi	Increase Decrease In Contract With Customer Refund Liability IncreaseDecreaseInContractWithCustomerRefundLiability	-1548000
CY2022	ccoi	Increase Decrease In Contract With Customer Refund Liability IncreaseDecreaseInContractWithCustomerRefundLiability	-282000
CY2021	ccoi	Increase Decrease In Contract With Customer Refund Liability IncreaseDecreaseInContractWithCustomerRefundLiability	-12000
CY2023	ccoi	Increase Decrease In Unfavorable Lease Liabilities IncreaseDecreaseInUnfavorableLeaseLiabilities	-26511000
CY2023	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	29045000
CY2022	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	20635000
CY2021	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	851000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	17345000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	173707000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	170257000
CY2023	ccoi	Proceeds From Consideration Received Under Ip Transit Agreement Classified As Investing Activities ProceedsFromConsiderationReceivedUnderIpTransitAgreementClassifiedAsInvestingActivities	204167000
CY2023	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	47100000
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-2191000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	129632000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	78971000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	69916000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	76726000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-78971000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-69916000
CY2022	ccoi	Redemption And Extinguishment Of2024 Notes RedemptionAndExtinguishmentOf2024Notes	375354000
CY2021	ccoi	Redemption And Extinguishment Of2022 Notes RedemptionAndExtinguishmentOf2022Notes	459317000
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	181716000
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	169857000
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	150288000
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	77362000
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	45472000
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	23054000
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	790000
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6922000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	173707000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	170257000
CY2023	ccoi	Proceeds From Consideration Received Under Ip Transit Agreement Classified As Investing Activities ProceedsFromConsiderationReceivedUnderIpTransitAgreementClassifiedAsInvestingActivities	204167000
CY2023	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	47100000
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-2191000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	129632000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	78971000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	69916000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	76726000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-78971000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-69916000
CY2022	ccoi	Redemption And Extinguishment Of2024 Notes RedemptionAndExtinguishmentOf2024Notes	375354000
CY2021	ccoi	Redemption And Extinguishment Of2022 Notes RedemptionAndExtinguishmentOf2022Notes	459317000
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	181716000
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	169857000
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	150288000
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	77362000
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	45472000
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	23054000
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	790000
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6922000
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1227000
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	614000
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1823000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-257851000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-144849000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-140825000
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1649000
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2599000
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2193000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-162131000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-52712000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-42677000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	275912000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	328624000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	371301000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	113781000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	275912000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	328624000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	104698000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	66479000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	59497000
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	35291000
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	7156000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	4452000
CY2023	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	232468000
CY2022	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	107875000
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1227000
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	614000
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1823000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-257851000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-144849000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-140825000
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1649000
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2599000
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2193000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-162131000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-52712000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-42677000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	275912000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	328624000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	371301000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	113781000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	275912000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	328624000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	104698000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	66479000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	59497000
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	35291000
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	7156000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	4452000
CY2023	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	232468000
CY2022	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	107875000
CY2021	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	50831000
CY2023	ccoi	Fair Value Of Equipment Acquired In Leases FairValueOfEquipmentAcquiredInLeases	141000
CY2022	ccoi	Fair Value Of Equipment Acquired In Leases FairValueOfEquipmentAcquiredInLeases	1969000
CY2023Q4	us-gaap	Number Of Countries In Which Entity Operates NumberOfCountriesInWhichEntityOperates	54
CY2023Q2	ccoi	Business Combination Estimated Working Capital Payments Made To Seller BusinessCombinationEstimatedWorkingCapitalPaymentsMadeToSeller	49865000
CY2023Q2	ccoi	Business Combination Amount Due From Seller Under Purchase Agreement Net Of Discount Noncurrent BusinessCombinationAmountDueFromSellerUnderPurchaseAgreementNetOfDiscountNoncurrent	36696000
CY2023Q2	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Net Of Discount BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementNetOfDiscount	620390000
CY2023Q2	ccoi	Business Combination Amount To Be Received From Seller BusinessCombinationAmountToBeReceivedFromSeller	657086000
CY2023Q2	ccoi	Business Combination Total Net Consideration To Be Received From Seller BusinessCombinationTotalNetConsiderationToBeReceivedFromSeller	607221000
CY2023Q3	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	24900000
CY2021	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	50831000
CY2023	ccoi	Fair Value Of Equipment Acquired In Leases FairValueOfEquipmentAcquiredInLeases	141000
CY2022	ccoi	Fair Value Of Equipment Acquired In Leases FairValueOfEquipmentAcquiredInLeases	1969000
CY2023Q4	us-gaap	Number Of Countries In Which Entity Operates NumberOfCountriesInWhichEntityOperates	54
CY2023Q2	ccoi	Business Combination Estimated Working Capital Payments Made To Seller BusinessCombinationEstimatedWorkingCapitalPaymentsMadeToSeller	49865000
CY2023Q2	ccoi	Business Combination Amount Due From Seller Under Purchase Agreement Net Of Discount Noncurrent BusinessCombinationAmountDueFromSellerUnderPurchaseAgreementNetOfDiscountNoncurrent	36696000
CY2023Q2	ccoi	Business Combination Amount Due From Seller Under Ip Transit Services Agreement Net Of Discount BusinessCombinationAmountDueFromSellerUnderIpTransitServicesAgreementNetOfDiscount	620390000
CY2023Q2	ccoi	Business Combination Amount To Be Received From Seller BusinessCombinationAmountToBeReceivedFromSeller	657086000
CY2023Q2	ccoi	Business Combination Total Net Consideration To Be Received From Seller BusinessCombinationTotalNetConsiderationToBeReceivedFromSeller	607221000
CY2023Q3	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	24900000
CY2023Q3	ccoi	Adjustment To Reclassify Operating Lease Liability To Finance Lease Liability AdjustmentToReclassifyOperatingLeaseLiabilityToFinanceLeaseLiability	160900000
CY2023Q4	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	254000000.0
CY2023Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	151100000
CY2022	ccoi	Business Combination Pro Forma Amortization Expenses Related To Unfavorable Lease Liability Increase Interest Expense BusinessCombinationProFormaAmortizationExpensesRelatedToUnfavorableLeaseLiabilityIncreaseInterestExpense	10900000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;margin:0pt 0pt 12pt 0pt;">Use of estimates</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 12pt 0pt;">The preparation of consolidated financial statements in conformity with United States generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates.</p>
CY2023Q3	ccoi	Adjustment To Reclassify Operating Lease Liability To Finance Lease Liability AdjustmentToReclassifyOperatingLeaseLiabilityToFinanceLeaseLiability	160900000
CY2023Q4	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	254000000.0
CY2023Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	151100000
CY2022	ccoi	Business Combination Pro Forma Amortization Expenses Related To Unfavorable Lease Liability Increase Interest Expense BusinessCombinationProFormaAmortizationExpensesRelatedToUnfavorableLeaseLiabilityIncreaseInterestExpense	10900000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;margin:0pt 0pt 12pt 0pt;">Use of estimates</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 12pt 0pt;">The preparation of consolidated financial statements in conformity with United States generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates.</p>
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2303000
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	10475000
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	9101000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3677000
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1510000
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	4318000
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	3525000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2303000
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1921000
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	5595000
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	6006000
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1510000
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	1900000
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	1900000
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	2200000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2303000
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	10475000
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	9101000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3677000
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1510000
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	4318000
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	3525000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2303000
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1921000
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	5595000
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	6006000
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1510000
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	1900000
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	1900000
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	2200000
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	64698000
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	28915000
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	34940000
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	23317000
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	92763000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	18331000
CY2023	us-gaap	Lease Cost LeaseCost	192401000
CY2022	us-gaap	Lease Cost LeaseCost	70563000
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	33080000
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	23317000
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	93924000
CY2022	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	18836000
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	77362000
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	45472000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	232468000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	107875000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	13682000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11168000
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P11Y6M
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P13Y6M
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y2M12D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y7M6D
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.076
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.086
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.081
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	64698000
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	28915000
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	34940000
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	23317000
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	92763000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	18331000
CY2023	us-gaap	Lease Cost LeaseCost	192401000
CY2022	us-gaap	Lease Cost LeaseCost	70563000
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	33080000
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	23317000
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	93924000
CY2022	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	18836000
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	77362000
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	45472000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	232468000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	107875000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	13682000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11168000
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P11Y6M
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P13Y6M
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y2M12D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P16Y7M6D
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.076
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.086
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.081
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.054
CY2023Q4	ccoi	Finance Lease Liability Payments Due Additional FinanceLeaseLiabilityPaymentsDueAdditional	242800000
CY2023Q4	us-gaap	Lessee Finance Lease Term Of Contract1 LesseeFinanceLeaseTermOfContract1	P20Y
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	79272000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	100357000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	62443000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	95370000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	57600000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	91955000
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.054
CY2023Q4	ccoi	Finance Lease Liability Payments Due Additional FinanceLeaseLiabilityPaymentsDueAdditional	242800000
CY2023Q4	us-gaap	Lessee Finance Lease Term Of Contract1 LesseeFinanceLeaseTermOfContract1	P20Y
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	79272000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	100357000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	62443000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	95370000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	57600000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	91955000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	51511000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	41469000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	48154000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	40198000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	328298000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	382361000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	627278000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	751710000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	229221000
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	267195000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	398057000
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	484515000
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	67962000
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	64594000
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	330095000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	419921000
CY2023Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	24300000
CY2022Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	23700000
CY2023	ccoi	Revenue Recognition Billing Due Receipts Contract Lengths Maximum RevenueRecognitionBillingDueReceiptsContractLengthsMaximum	P60M
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	51511000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	41469000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	48154000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	40198000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	328298000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	382361000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	627278000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	751710000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	229221000
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	267195000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	398057000
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	484515000
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	67962000
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	64594000
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	330095000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	419921000
CY2023Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	24300000
CY2022Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	23700000
CY2023	ccoi	Revenue Recognition Billing Due Receipts Contract Lengths Maximum RevenueRecognitionBillingDueReceiptsContractLengthsMaximum	P60M
CY2023	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	50200000
CY2022	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	15400000
CY2021	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	18500000
CY2023Q4	ccoi	Ratio Of Additional Indebtedness To Net Capital RatioOfAdditionalIndebtednessToNetCapital	4.0
CY2023Q4	ccoi	Fixed Charge Coverage Ratio FixedChargeCoverageRatio	2.0
CY2023	ccoi	Debt Instrument Covenant Permitted Investments And Payments DebtInstrumentCovenantPermittedInvestmentsAndPayments	511300000
CY2023	ccoi	Debt Instrument Covenant Permitted Investments And Payments DebtInstrumentCovenantPermittedInvestmentsAndPayments	511300000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	17959000
CY2023	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	50200000
CY2022	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	15400000
CY2021	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	18500000
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;margin:0pt 0pt 12pt 0pt;">Concentrations of credit risk</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 12pt 0pt;">The Company’s assets that are exposed to credit risk consist of its cash and cash equivalents, other assets and accounts receivable. As of December 31, 2023 and 2022, the Company’s cash equivalents were invested in demand deposit accounts, overnight investments and money market funds. The Company places its cash equivalents in instruments that meet high-quality credit standards as specified in the Company’s investment policy guidelines. Accounts receivable are due from customers located in major metropolitan areas in the United States, Europe, Canada, Mexico, South America, Oceania and Africa. Receivables from the Company’s net-centric (wholesale) customers are generally subject to a higher degree of credit risk than the Company’s corporate customers.</p>
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;margin:0pt 0pt 12pt 0pt;">Concentrations of credit risk</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 12pt 0pt;">The Company’s assets that are exposed to credit risk consist of its cash and cash equivalents, other assets and accounts receivable. As of December 31, 2023 and 2022, the Company’s cash equivalents were invested in demand deposit accounts, overnight investments and money market funds. The Company places its cash equivalents in instruments that meet high-quality credit standards as specified in the Company’s investment policy guidelines. Accounts receivable are due from customers located in major metropolitan areas in the United States, Europe, Canada, Mexico, South America, Oceania and Africa. Receivables from the Company’s net-centric (wholesale) customers are generally subject to a higher degree of credit risk than the Company’s corporate customers.</p>
CY2021Q1	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1.032
CY2023Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	6.0
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47373361
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46875992
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46419180
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47837512
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47207298
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46963920
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47373361
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46875992
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46419180
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47837512
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47207298
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46963920
CY2023Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1537817000
CY2022Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	4911000
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13696000
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	11880000
CY2023Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	41820000
CY2022Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	2687000
CY2023Q4	us-gaap	Interest Payable Current InterestPayableCurrent	5636000
CY2022Q4	us-gaap	Interest Payable Current InterestPayableCurrent	4656000
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	120523000
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	63889000
CY2022Q2	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1.01094
CY2021Q1	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1.032
CY2023Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	6.0
CY2023Q4	ccoi	Ratio Of Additional Indebtedness To Net Capital RatioOfAdditionalIndebtednessToNetCapital	4.0
CY2023Q4	ccoi	Fixed Charge Coverage Ratio FixedChargeCoverageRatio	2.0
CY2023Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1537817000
CY2022Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	544430000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92200000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	89200000
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	31254000
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	19488000
CY2023Q4	ccoi	Accrued Interest Rate Swap Agreement Current AccruedInterestRateSwapAgreementCurrent	21568000
CY2022Q4	ccoi	Accrued Interest Rate Swap Agreement Current AccruedInterestRateSwapAgreementCurrent	20267000
CY2023Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	6549000
CY2022Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	4911000
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13696000
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	11880000
CY2023Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	41820000
CY2022Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	2687000
CY2023Q4	us-gaap	Interest Payable Current InterestPayableCurrent	5636000
CY2022Q4	us-gaap	Interest Payable Current InterestPayableCurrent	4656000
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	120523000
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	63889000
CY2022Q2	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1.01094
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	143000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	17959000
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-16086000
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-16086000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	500000000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	450000000
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	950000000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1217084000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	34784000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	73753000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	2393000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-8408000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-2333000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1219477000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	26376000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	71420000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3638000
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	11868000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4195000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3116000
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	203000
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	496000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1833000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-53393000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	16299000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	500000000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	450000000
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	950000000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1217084000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	34784000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	73753000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	2393000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-8408000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-2333000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1219477000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	26376000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	71420000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3638000
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	11868000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4195000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3116000
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	203000
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	496000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1833000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-53393000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	16299000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2348000
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-194000
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	97000
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2021000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-53964000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21230000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23235000
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	143000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2348000
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-194000
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	97000
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2021000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-53964000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21230000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23235000
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	244306000
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	226625000
CY2023Q4	ccoi	Deferred Tax Assets Interest Expense Limitation DeferredTaxAssetsInterestExpenseLimitation	34828000
CY2022Q4	ccoi	Deferred Tax Assets Interest Expense Limitation DeferredTaxAssetsInterestExpenseLimitation	12331000
CY2023Q4	ccoi	Deferred Tax Assets Accrued Liabilities And Other DeferredTaxAssetsAccruedLiabilitiesAndOther	12055000
CY2022Q4	ccoi	Deferred Tax Assets Accrued Liabilities And Other DeferredTaxAssetsAccruedLiabilitiesAndOther	9972000
CY2023Q4	ccoi	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	107563000
CY2022Q4	ccoi	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	32769000
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	398752000
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	281697000
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Files In Submission

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COGENT COMMUNICATIONS HOLDINGS, INC. Stock $ccoi

2024 Q1 Form 10-K Financial Statement

#000141057824000091 Filed on February 29, 2024

Income Statement

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Facts In Submission

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$CCOI COGENT COMMUNICATIONS HOLDINGS, INC. Stock $ccoi

2024 Q1 Form 10-K Financial Statement

#000141057824000091 Filed on February 29, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CCOI
COGENT COMMUNICATIONS HOLDINGS, INC. Stock $ccoi