$NSP
INSPERITY, INC. Stock $nsp

$nsp Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000100075318000015 Filed on February 12, 2018

Income Statement

Concept	2017 Q4	2017 Q3	2017
Revenue	$826.5M	$795.5M	$3.300B
YoY Change	13.36%	13.23%	12.2%
Cost Of Revenue	$683.6M	$655.5M	$2.728B
YoY Change	10.53%	12.11%	11.34%
Gross Profit	$142.9M	$140.0M	$572.7M
YoY Change	29.24%	18.82%	16.5%
Gross Profit Margin	17.29%	17.59%	17.35%
Selling, General & Admin	$114.3M	$105.5M	$424.6M
YoY Change	24.37%	15.93%	15.16%
% of Gross Profit	80.01%	75.38%	74.14%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$4.800M	$4.700M	$18.18M
YoY Change	17.07%	14.63%	9.24%
% of Gross Profit	3.36%	3.36%	3.17%
Operating Expenses	$119.2M	$110.2M	$442.8M
YoY Change	24.04%	15.94%	14.92%
Operating Profit	$23.71M	$29.80M	$129.9M
YoY Change	63.9%	30.85%	22.23%
Interest Expense	$400.0K	$894.0K	$3.213M
YoY Change	-500.0%	42.36%	34.1%
% of Operating Profit	1.69%	3.0%	2.47%
Other Income/Expense, Net
YoY Change
Pretax Income	$24.10M	$29.92M	$130.1M
YoY Change	68.53%	33.1%	23.74%
Income Tax	$6.000M	$10.72M	$45.74M
% Of Pretax Income	24.9%	35.82%	35.15%
Net Earnings	$15.55M	$19.20M	$84.40M
YoY Change	63.38%	36.52%	27.9%
Net Earnings / Revenue	1.88%	2.41%	2.56%
Basic Earnings Per Share	$0.36	$0.46	$2.02
Diluted Earnings Per Share	$0.36	$0.46	$2.01
COMMON SHARES
Basic Shares Outstanding	20.84M shares	40.95M shares	41.07M shares
Diluted Shares Outstanding		41.24M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017
SHORT-TERM ASSETS
Cash & Short-Term Investments	$356.2M	$287.9M	$356.2M
YoY Change	23.72%	27.73%	23.72%
Cash & Equivalents	$354.3M	$285.9M	$354.3M
Short-Term Investments	$2.000M	$2.000M	$2.000M
Other Short-Term Assets	$26.99M	$19.26M	$78.90M
YoY Change	38.23%	4.53%	2.2%
Inventory
Prepaid Expenses
Receivables	$12.29M	$3.396M	$86.90M
Other Receivables	$256.9M	$4.100M	$256.9M
Total Short-Term Assets	$778.9M	$671.0M	$778.9M
YoY Change	21.65%	22.3%	21.65%
LONG-TERM ASSETS
Property, Plant & Equipment	$95.66M	$93.74M	$95.70M
YoY Change	19.18%	28.88%	19.18%
Goodwill	$12.69M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$3.541M	$4.484M	$176.3M
YoY Change	92.45%	102.62%	1.61%
Total Long-Term Assets	$284.8M	$276.3M	$284.8M
YoY Change	6.71%	12.23%	6.71%
TOTAL ASSETS
Total Short-Term Assets	$778.9M	$671.0M	$778.9M
Total Long-Term Assets	$284.8M	$276.3M	$284.8M
Total Assets	$1.064B	$947.4M	$1.064B
YoY Change	17.25%	19.18%	17.25%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$6.447M	$3.070M	$6.400M
YoY Change	53.9%	-23.9%	52.38%
Accrued Expenses	$25.99M	$20.86M	$720.0M
YoY Change	15.83%	-9.99%	20.64%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$724.7M	$579.3M	$726.5M
YoY Change	20.6%	19.49%	20.88%
LONG-TERM LIABILITIES
Long-Term Debt	$104.4M	$104.4M	$104.4M
YoY Change	0.0%	0.0%	0.0%
Other Long-Term Liabilities	$1.752M	$161.7M	$166.5M
YoY Change	-98.76%	18.9%	17.83%
Total Long-Term Liabilities	$272.6M	$266.1M	$270.9M
YoY Change	10.97%	10.67%	10.26%
TOTAL LIABILITIES
Total Short-Term Liabilities	$724.7M	$579.3M	$726.5M
Total Long-Term Liabilities	$272.6M	$266.1M	$270.9M
Total Liabilities	$997.4M	$845.4M	$997.4M
YoY Change	17.8%	16.56%	17.81%
SHAREHOLDERS EQUITY
Retained Earnings	$296.8M	$329.2M
YoY Change	6.7%	20.17%
Common Stock	$25.89M	$20.72M
YoY Change	172.06%	182.85%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$256.4M	$248.0M
YoY Change	12.86%	17.15%
Treasury Stock Shares	14.01M shares
Shareholders Equity	$66.32M	$101.9M	$66.30M
YoY Change
Total Liabilities & Shareholders Equity	$1.064B	$947.4M	$1.064B
YoY Change	17.25%	19.18%	17.25%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017
OPERATING ACTIVITIES
Net Income	$15.55M	$19.20M	$84.40M
YoY Change	63.38%	36.52%	27.9%
Depreciation, Depletion And Amortization	$4.800M	$4.700M	$18.18M
YoY Change	17.07%	14.63%	9.24%
Cash From Operating Activities	$144.8M	$42.40M	$213.2M
YoY Change	30.92%	-263.71%	46.66%
INVESTING ACTIVITIES
Capital Expenditures	-$6.800M	-$5.700M	$33.34M
YoY Change	-46.46%	-34.48%	-1.93%
Acquisitions
YoY Change
Other Investing Activities	$300.0K	-$100.0K	$100.0K
YoY Change		-200.0%	-98.75%
Cash From Investing Activities	-$6.600M	-$5.800M	-$33.25M
YoY Change	-48.03%	-32.56%	27.8%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$0.00
YoY Change			-100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-59.10M	-7.500M	-$102.9M
YoY Change	160.35%	-44.85%	14.18%
NET CHANGE
Cash From Operating Activities	144.8M	42.40M	$213.2M
Cash From Investing Activities	-6.600M	-5.800M	-$33.25M
Cash From Financing Activities	-59.10M	-7.500M	-$102.9M
Net Change In Cash	79.10M	29.10M	$77.00M
YoY Change	5.19%	-160.5%	163.79%
FREE CASH FLOW
Cash From Operating Activities	$144.8M	$42.40M	$213.2M
Capital Expenditures	-$6.800M	-$5.700M	$33.34M
Free Cash Flow	$151.6M	$48.10M	$179.9M
YoY Change	22.95%	-379.65%	61.5%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q4	nsp	Accrued Corporate Payroll And Commissions Earned AccruedCorporatePayrollAndCommissionsEarned	52595000	USD
CY2015	nsp	Accrued Corporate Payroll Commissions And Other Accrued Liabilities AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities	4105000	USD
CY2016	nsp	Accrued Corporate Payroll Commissions And Other Accrued Liabilities AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities	3150000	USD
CY2017	nsp	Accrued Corporate Payroll Commissions And Other Accrued Liabilities AccruedCorporatePayrollCommissionsAndOtherAccruedLiabilities	17138000	USD
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	1328743004	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	INSPERITY, INC.
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017	nsp	Decrease Increase In Accrued Workers Compensation Costs For Changes In Estimated Losses DecreaseIncreaseInAccruedWorkersCompensationCostsForChangesInEstimatedLosses	16300000	USD
CY2017	nsp	Accounts Receivable Due Date Prior To Applicable Payroll Date AccountsReceivableDueDatePriorToApplicablePayrollDate	P1D
CY2016Q4	nsp	Accrued Corporate Payroll And Commissions Earned AccruedCorporatePayrollAndCommissionsEarned	40761000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001000753
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	41484357	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2016Q4	nsp	Accrued Health Insurance Costs AccruedHealthInsuranceCosts	26360000	USD
CY2017Q4	nsp	Accrued Health Insurance Costs AccruedHealthInsuranceCosts	26075000	USD
CY2016Q4	nsp	Accrued Payroll Taxes And Other Payroll Deductions Current AccruedPayrollTaxesAndOtherPayrollDeductionsCurrent	247766000	USD
CY2017Q4	nsp	Accrued Payroll Taxes And Other Payroll Deductions Current AccruedPayrollTaxesAndOtherPayrollDeductionsCurrent	303247000	USD
CY2016Q4	nsp	Accrued Worksite Employee Payroll Costs AccruedWorksiteEmployeePayrollCosts	215214000	USD
CY2017Q4	nsp	Accrued Worksite Employee Payroll Costs AccruedWorksiteEmployeePayrollCosts	267402000	USD
CY2015	nsp	Adjusted Weighted Average Common Shares Outstanding AdjustedWeightedAverageCommonSharesOutstanding	48630000	shares
CY2016	nsp	Adjusted Weighted Average Common Shares Outstanding AdjustedWeightedAverageCommonSharesOutstanding	41762000	shares
CY2017	nsp	Adjusted Weighted Average Common Shares Outstanding AdjustedWeightedAverageCommonSharesOutstanding	41271000	shares
CY2017Q4	nsp	Applicable Margin30 Day Libor ApplicableMargin30DayLibor	0.0200
CY2017Q4	nsp	Applicable Margin Federal Funds Rate ApplicableMarginFederalFundsRate	0.0050
CY2017Q4	nsp	Benefits Costs Incurred Relatedto Runoff BenefitsCostsIncurredRelatedtoRunoff	1200000	USD
CY2016Q4	nsp	Cash Equivalents And Marketable Securities At Carrying Value CashEquivalentsAndMarketableSecuritiesAtCarryingValue	285173000	USD
CY2017Q4	nsp	Cash Equivalents And Marketable Securities At Carrying Value CashEquivalentsAndMarketableSecuritiesAtCarryingValue	362706000	USD
CY2016Q4	nsp	Cash Held In Demand Accounts CashHeldInDemandAccounts	25758000	USD
CY2017Q4	nsp	Cash Held In Demand Accounts CashHeldInDemandAccounts	26700000	USD
CY2016Q4	nsp	Computer Hardware And Software ComputerHardwareAndSoftware	97311000	USD
CY2017Q4	nsp	Computer Hardware And Software ComputerHardwareAndSoftware	105060000	USD
CY2016	nsp	Decrease Increase In Accrued Workers Compensation Costs For Changes In Estimated Losses DecreaseIncreaseInAccruedWorkersCompensationCostsForChangesInEstimatedLosses	10900000	USD
CY2016Q4	nsp	Deposits Health Insurance DepositsHealthInsurance	4700000	USD
CY2017Q4	nsp	Deposits Health Insurance DepositsHealthInsurance	5300000	USD
CY2016Q4	nsp	Deposits Workers Compensation DepositsWorkersCompensation	143938000	USD
CY2017Q4	nsp	Deposits Workers Compensation DepositsWorkersCompensation	154215000	USD
CY2017	nsp	Enactmentof Us Tax Reform EnactmentofUSTaxReform	2500000	USD
CY2017	nsp	Future Non Cancelable Purchase And Service Obligations Disclosure Threshold FutureNonCancelablePurchaseAndServiceObligationsDisclosureThreshold	greater than $100,000 and one year
CY2016Q4	nsp	Goodwill And Other Intangible Assets Net GoodwillAndOtherIntangibleAssetsNet	13088000	USD
CY2017Q4	nsp	Goodwill And Other Intangible Assets Net GoodwillAndOtherIntangibleAssetsNet	12762000	USD
CY2015	nsp	Gross Billings GrossBillings	15806000000	USD
CY2016	nsp	Gross Billings GrossBillings	17933000000	USD
CY2017	nsp	Gross Billings GrossBillings	20174000000	USD
CY2015	nsp	Increase Decrease In Restricted Cash Net From Acquisitions IncreaseDecreaseInRestrictedCashNetFromAcquisitions	-6622000	USD
CY2016	nsp	Increase Decrease In Restricted Cash Net From Acquisitions IncreaseDecreaseInRestrictedCashNetFromAcquisitions	5219000	USD
CY2017	nsp	Increase Decrease In Restricted Cash Net From Acquisitions IncreaseDecreaseInRestrictedCashNetFromAcquisitions	-1500000	USD
CY2015	nsp	Incremental Shares From Assumed Conversions Of Common Stock Options IncrementalSharesFromAssumedConversionsOfCommonStockOptions	14000	shares
CY2016	nsp	Incremental Shares From Assumed Conversions Of Common Stock Options IncrementalSharesFromAssumedConversionsOfCommonStockOptions	94000	shares
CY2017	nsp	Incremental Shares From Assumed Conversions Of Common Stock Options IncrementalSharesFromAssumedConversionsOfCommonStockOptions	204000	shares
CY2015	nsp	Marketable Securities Proceeds From Dispositions MarketableSecuritiesProceedsFromDispositions	17869000	USD
CY2016	nsp	Marketable Securities Proceeds From Dispositions MarketableSecuritiesProceedsFromDispositions	7268000	USD
CY2017	nsp	Marketable Securities Proceeds From Dispositions MarketableSecuritiesProceedsFromDispositions	0	USD
CY2016Q1	nsp	Max Amount Of Tender Offer For Repurchase Of Shares MaxAmountOfTenderOfferForRepurchaseOfShares	125000000	USD
CY2016Q4	nsp	Money Market Funds Overnight Holdings At Carrying Value MoneyMarketFundsOvernightHoldingsAtCarryingValue	255091000	USD
CY2017Q4	nsp	Money Market Funds Overnight Holdings At Carrying Value MoneyMarketFundsOvernightHoldingsAtCarryingValue	338112000	USD
CY2015	nsp	Net Income Loss Available To Common Shareholders Basic NetIncomeLossAvailableToCommonShareholdersBasic	38409000	USD
CY2016	nsp	Net Income Loss Available To Common Shareholders Basic NetIncomeLossAvailableToCommonShareholdersBasic	64495000	USD
CY2017	nsp	Net Income Loss Available To Common Shareholders Basic NetIncomeLossAvailableToCommonShareholdersBasic	82885000	USD
CY2017	nsp	Number Of Days In Advance Of Beginning Of Reporting Quarter Carrier Establishes Cash Funding Rates NumberOfDaysInAdvanceOfBeginningOfReportingQuarterCarrierEstablishesCashFundingRates	P90D
CY2017Q4	nsp	Number Of Stock Based Employee Compensation Plans NumberOfStockBasedEmployeeCompensationPlans	1
CY2015	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	2165747000	USD
CY2016	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	2449737000	USD
CY2017	nsp	Payroll Taxes Benefits And Workers Compensation Costs PayrollTaxesBenefitsAndWorkersCompensationCosts	2727492000	USD
CY2016Q4	nsp	Payroll Withholdings Included In Cash Balance PayrollWithholdingsIncludedInCashBalance	221700000	USD
CY2017Q4	nsp	Payroll Withholdings Included In Cash Balance PayrollWithholdingsIncludedInCashBalance	271500000	USD
CY2017	nsp	Percentage Of Subsidiary Stock Securing Debt PercentageOfSubsidiaryStockSecuringDebt	0.65
CY2017	nsp	Percentageofgrantsissuedtodirectorsthatarevestedforannualawardgrants. Percentageofgrantsissuedtodirectorsthatarevestedforannualawardgrants.	1.00
CY2017Q4	nsp	Portionofinsurancecoststhatislessthantheagreeduponsurplusincludedinaccruedhealthinsurancecostsacntliab Portionofinsurancecoststhatislessthantheagreeduponsurplusincludedinaccruedhealthinsurancecostsacntliab	3100000	USD
CY2017Q4	nsp	Premiums Owed To United PremiumsOwedToUnited	21900000	USD
CY2016Q4	nsp	Prepaid Health Insurance PrepaidHealthInsurance	9000000	USD
CY2017Q4	nsp	Prepaid Health Insurance PrepaidHealthInsurance	9000000	USD
CY2017Q4	nsp	Prepaid Health Insurance Current And Noncurrent PrepaidHealthInsuranceCurrentAndNoncurrent	12100000	USD
CY2017Q4	nsp	Required Deposit For Health Care Costs RequiredDepositForHealthCareCosts	5100000	USD
CY2017	nsp	Return Of Excess Claim Funds ReturnOfExcessClaimFunds	22700000	USD
CY2015	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	211060000	USD
CY2016	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	229589000	USD
CY2017	nsp	Salaries Wages And Payroll Taxes SalariesWagesAndPayrollTaxes	259531000	USD
CY2016Q4	nsp	Software Development Costs SoftwareDevelopmentCosts	51956000	USD
CY2017Q4	nsp	Software Development Costs SoftwareDevelopmentCosts	60568000	USD
CY2014	nsp	Special Dividend SpecialDividend	50700000	USD
CY2017Q4	nsp	Special Dividend SpecialDividend	41700000	USD
CY2017Q4	nsp	Specialdividendpershare Specialdividendpershare	1.00
CY2015Q4	nsp	Texas Salesand Use Tax Assessment Settlement Amount TexasSalesandUseTaxAssessmentSettlementAmount	200000	USD
CY2017	nsp	Time Period Estimate Of Incurred Claim Costs To Be Paid Included In Long Term Liabilities TimePeriodEstimateOfIncurredClaimCostsToBePaidIncludedInLongTermLiabilities	Greater than 1 year
CY2017	nsp	Time Period Estimate Of Incurred Claim Costs To Be Paid Included In Short Term Liabilities TimePeriodEstimateOfIncurredClaimCostsToBePaidIncludedInShortTermLiabilities	P1Y
CY2017	nsp	Time Period Incurred Claims Expected To Be Paid Included In Deposits TimePeriodIncurredClaimsExpectedToBePaidIncludedInDeposits	Greater than 1 year
CY2017	nsp	Time Period Incurred Claims Expected To Be Paid Recorded As Restricted Cash TimePeriodIncurredClaimsExpectedToBePaidRecordedAsRestrictedCash	P1Y
CY2016Q4	nsp	Total Cash Cash Equivalents And Marketable Securities TotalCashCashEquivalentsAndMarketableSecurities	287885000	USD
CY2017Q4	nsp	Total Cash Cash Equivalents And Marketable Securities TotalCashCashEquivalentsAndMarketableSecurities	356220000	USD
CY2015	nsp	Total Impairments Goodwill Intangiblesand Assets TotalImpairmentsGoodwillIntangiblesandAssets	10480000	USD
CY2016	nsp	Total Impairments Goodwill Intangiblesand Assets TotalImpairmentsGoodwillIntangiblesandAssets	0	USD
CY2017	nsp	Total Impairments Goodwill Intangiblesand Assets TotalImpairmentsGoodwillIntangiblesandAssets	0	USD
CY2016Q1	nsp	Transaction Costs Relatedto Tender Offer TransactionCostsRelatedtoTenderOffer	1100000	USD
CY2015	nsp	Treasury Stock Acquired TreasuryStockAcquired	67113000	USD
CY2016	nsp	Treasury Stock Acquired TreasuryStockAcquired	31669000	USD
CY2017	nsp	Treasury Stock Acquired TreasuryStockAcquired	38735000	USD
CY2016	nsp	Us Treasury Rates That Correspond With Weighted Average Estimated Claim Payout Period USTreasuryRatesThatCorrespondWithWeightedAverageEstimatedClaimPayoutPeriod	0.010
CY2016	nsp	Us Treasury Rates That Correspond With Weighted Average Estimated Claim Payout Period USTreasuryRatesThatCorrespondWithWeightedAverageEstimatedClaimPayoutPeriod	0.01
CY2017	nsp	Us Treasury Rates That Correspond With Weighted Average Estimated Claim Payout Period USTreasuryRatesThatCorrespondWithWeightedAverageEstimatedClaimPayoutPeriod	0.016
CY2016Q4	nsp	Unbilled Unbilled	254999000	USD
CY2017Q4	nsp	Unbilled Unbilled	318431000	USD
CY2016Q4	nsp	Unbilled Accrued Worksite Employee Payroll Costs UnbilledAccruedWorksiteEmployeePayrollCosts	215214000	USD
CY2017Q4	nsp	Unbilled Accrued Worksite Employee Payroll Costs UnbilledAccruedWorksiteEmployeePayrollCosts	267402000	USD
CY2016	nsp	Undiscounted Accrued Workers Compensation Costs UndiscountedAccruedWorkersCompensationCosts	194200000	USD
CY2017	nsp	Undiscounted Accrued Workers Compensation Costs UndiscountedAccruedWorkersCompensationCosts	219900000	USD
CY2016	nsp	Vestingperiodfor Initialgrantstomembersofthe Boardof Directors VestingperiodforInitialgrantstomembersoftheBoardofDirectors	P3Y
CY2017	nsp	Vestingperiodfor Initialgrantstomembersofthe Boardof Directors VestingperiodforInitialgrantstomembersoftheBoardofDirectors	P0Y
CY2016Q4	nsp	Workers Compensation Administrative Fees Accrued WorkersCompensationAdministrativeFeesAccrued	1600000	USD
CY2017Q4	nsp	Workers Compensation Administrative Fees Accrued WorkersCompensationAdministrativeFeesAccrued	1800000	USD
CY2016	nsp	Workers Compensation Claims Paid WorkersCompensationClaimsPaid	40697000	USD
CY2017	nsp	Workers Compensation Claims Paid WorkersCompensationClaimsPaid	40184000	USD
CY2016	nsp	Workers Compensation Discount Changed During Period WorkersCompensationDiscountChangedDuringPeriod	2628000	USD
CY2017	nsp	Workers Compensation Discount Changed During Period WorkersCompensationDiscountChangedDuringPeriod	4308000	USD
CY2016	nsp	Workers Compensation Expense WorkersCompensationExpense	65069000	USD
CY2017	nsp	Workers Compensation Expense WorkersCompensationExpense	68194000	USD
CY2016Q4	nsp	Workers Compensation Liability Current Net WorkersCompensationLiabilityCurrentNet	42637000	USD
CY2017Q4	nsp	Workers Compensation Liability Current Net WorkersCompensationLiabilityCurrentNet	41137000	USD
CY2010Q4	nsp	Workers Compensation Maximum Aggregate Economic Burden For Claims In Excess Of First Layer Cap Per Policy Year WorkersCompensationMaximumAggregateEconomicBurdenForClaimsInExcessOfFirstLayerCapPerPolicyYear	5000000	USD
CY2010Q3	nsp	Workers Compensation Maximum Economic Burden First Layer Of Claims Per Occurrence WorkersCompensationMaximumEconomicBurdenFirstLayerOfClaimsPerOccurrence	1000000	USD
CY2015	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	13202000000	USD
CY2016	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	14992000000	USD
CY2017	nsp	Worksite Employee Payroll Cost WorksiteEmployeePayrollCost	16874000000	USD
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	4189000	USD
CY2015	us-gaap	Advertising Expense AdvertisingExpense	15980000	USD
CY2016	us-gaap	Advertising Expense AdvertisingExpense	16447000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	16686000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	6447000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	13107000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	12292000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	22437000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	27741000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	202854000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	214690000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	8962000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	25337000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13345000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16643000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	24345000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	2216000	USD
CY2015	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	25693000	USD
CY2016	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	66682000	USD
CY2017	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	120023000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	700000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	600000	USD
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2015Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	9800000	USD
CY2015Q2	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1300000	USD
CY2015Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	-600000	USD
CY2015	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10480000	USD
CY2016	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2016Q4	us-gaap	Assets Assets	907174000	USD
CY2017Q4	us-gaap	Assets Assets	1063695000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	640322000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	778935000	USD
CY2016Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	285173000	USD
CY2017Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	362706000	USD
CY2017Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1965000	USD
CY2016Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1851000	USD
CY2017Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1960000	USD
CY2016Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1854000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1965000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	105000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	104000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1860000	USD
CY2016Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.125
CY2016Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.125
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-6918000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1856000	USD
CY2016	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	0	USD
CY2017	us-gaap	Available For Sale Securities Gross Unrealized Gains AvailableForSaleSecuritiesGrossUnrealizedGains	0	USD
CY2016	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	3000	USD
CY2017	us-gaap	Available For Sale Securities Gross Unrealized Loss AvailableForSaleSecuritiesGrossUnrealizedLoss	5000	USD
CY2016Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	90151000	USD
CY2017Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	95615000	USD
CY2015	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	3300000	USD
CY2016	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	3000000	USD
CY2017	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	4100000	USD
CY2016Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	10400000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	14900000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	276456000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	269538000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	286034000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	354260000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	283322000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	360746000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	16496000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	68226000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.110
CY2016Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.125
CY2017Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.125
CY2017Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.150
CY2017Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.150
CY2017Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.150
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	55489000	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	55489000	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	555000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	555000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	39387000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	65988000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	84400000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	35221000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	31045000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	30009000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	40962000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	36235000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	35997000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5741000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5190000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5988000	USD
CY2016Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	21256000	USD
CY2017Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	23603000	USD
CY2017	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.0299
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-13632000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2641000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	9549000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-14733000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2951000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9742000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1101000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	310000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	193000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	618000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	4000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	27078000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	14662000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1021000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	667000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	14025000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	4283000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	14025000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	4283000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	26054000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	13993000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1300000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	774000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	8590000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	3510000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	6217000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4233000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	349000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	212000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	1092000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	676000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	7891000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	4586000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1024000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	669000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	12029000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9710000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	7133000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	3957000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	3960000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	3732000	USD
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.01
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5300000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7700000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15400000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	2216000	USD
CY2016Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	38483000	USD
CY2017Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	42891000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	84259000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	86693000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	936000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2021000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	18565000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	16644000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	18182000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	18565000	USD
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CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	18182000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	21153000	USD
CY2016	us-gaap	Dividends Common Stock DividendsCommonStock	20599000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	65768000	USD
CY2016Q4	us-gaap	Drafts Payable DraftsPayable	23046000	USD
CY2017Q4	us-gaap	Drafts Payable DraftsPayable	33186000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
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CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.02
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CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
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CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.54
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CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.36
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	39186000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45739000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	2559000	USD
CY2015	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	627000	USD
CY2016	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	686000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	101273000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	12686000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	12686000	USD
CY2016Q4	us-gaap	Goodwill Gross GoodwillGross	21156000	USD
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	21156000	USD
CY2016Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	8470000	USD
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	8470000	USD
CY2015	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2015	us-gaap	Gross Profit GrossProfit	437867000	USD
CY2016Q1	us-gaap	Gross Profit GrossProfit	150016000	USD
CY2016Q2	us-gaap	Gross Profit GrossProfit	113259000	USD
CY2016Q3	us-gaap	Gross Profit GrossProfit	117796000	USD
CY2016Q4	us-gaap	Gross Profit GrossProfit	110539000	USD
CY2016	us-gaap	Gross Profit GrossProfit	491610000	USD
CY2017Q1	us-gaap	Gross Profit GrossProfit	159346000	USD
CY2017Q2	us-gaap	Gross Profit GrossProfit	130553000	USD
CY2017Q3	us-gaap	Gross Profit GrossProfit	139966000	USD
CY2017Q4	us-gaap	Gross Profit GrossProfit	142866000	USD
CY2017	us-gaap	Gross Profit GrossProfit	572731000	USD
CY2015	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2016	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2017	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65619000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	105177000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	130141000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26229000	USD
CY2017	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	875000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22967000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	36812000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	45549000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1669000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1669000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	2649000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-1338000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-6218000	USD
CY2015	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-1060000	USD
CY2016	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-7920000	USD
CY2017	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-4875000	USD
CY2016	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	12717000	USD
CY2017	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	-285000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	54000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-204000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-707000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2696000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3684000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4085000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	0	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	0	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	669000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	530000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	751000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	634000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	39806000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	44148000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	40872000	USD
CY2016Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	4949000	USD
CY2017Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	9824000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	707000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-1192000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	2258000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	25549000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	69619000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	63697000	USD
CY2015	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-30479000	USD
CY2016	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	53297000	USD
CY2017	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	52188000	USD
CY2015	us-gaap	Increase Decrease In Health Care Insurance Liabilities IncreaseDecreaseInHealthCareInsuranceLiabilities	-4686000	USD
CY2015	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-514000	USD
CY2016	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	2391000	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	7465000	USD
CY2015	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	29052000	USD
CY2016	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	42373000	USD
CY2017	us-gaap	Increase Decrease In Other Employee Related Liabilities IncreaseDecreaseInOtherEmployeeRelatedLiabilities	55481000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	22069000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	8941000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	12773000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-13884000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	7624000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-4259000	USD
CY2015	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	26159000	USD
CY2016	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	21723000	USD
CY2017	us-gaap	Increase Decrease In Workers Compensation Liabilities IncreaseDecreaseInWorkersCompensationLiabilities	23945000	USD
CY2015	us-gaap	Interest Expense InterestExpense	459000	USD
CY2016	us-gaap	Interest Expense InterestExpense	2396000	USD
CY2017	us-gaap	Interest Expense InterestExpense	3213000	USD
CY2015	us-gaap	Interest Income Other InterestIncomeOther	379000	USD
CY2016	us-gaap	Interest Income Other InterestIncomeOther	1267000	USD
CY2017	us-gaap	Interest Income Other InterestIncomeOther	3413000	USD
CY2015	us-gaap	Interest Paid InterestPaid	459000	USD
CY2016	us-gaap	Interest Paid InterestPaid	2396000	USD
CY2017	us-gaap	Interest Paid InterestPaid	3213000	USD
CY2015	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-836000	USD
CY2016	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-90000	USD
CY2017	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-80000	USD
CY2016Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	1851000	USD
CY2017Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	1960000	USD
CY2016Q4	us-gaap	Land Land	5214000	USD
CY2017Q4	us-gaap	Land Land	6215000	USD
CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1000000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	907174000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1063695000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	600958000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	726481000	USD
CY2016Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	245691000	USD
CY2017Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	270893000	USD
CY2015Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	0	USD
CY2016Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	0	USD
CY2017Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	0	USD
CY2017Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	200000000	USD
CY2017	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0025
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	104400000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	104400000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	104400000	USD
CY2016Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	104400000	USD
CY2016Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	1851000	USD
CY2017Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	1960000	USD
CY2016Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	28231000	USD
CY2017Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	22634000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-84373000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-90160000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-102949000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	12372000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-26017000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-33250000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	65083000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	132673000	USD
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	204425000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	39390000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	32693000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	9713000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	14065000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	9520000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	65991000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	35628000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	14018000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	19202000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	15554000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	84402000	USD
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	1500000	USD
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	6800000	USD
CY2016	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Diluted Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare	0.04
CY2017	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Diluted Earnings Per Share NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnDilutedEarningsPerShare	0.16
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2015	us-gaap	Operating Expenses OperatingExpenses	372168000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	385304000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	442790000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	65699000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	53043000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	16023000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	22773000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	14467000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	106306000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	53492000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	22938000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	29799000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	23712000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	129941000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	68897000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	15358000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	7236000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	8401000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	11058000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	13849000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	12995000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	13600000	USD
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	15000000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	15400000	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	186591000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	189101000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	19526000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	26991000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1840000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	3541000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	10593000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1715000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-3000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-3000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2000	USD
CY2016Q4	us-gaap	Other Receivables OtherReceivables	2178000	USD
CY2017Q4	us-gaap	Other Receivables OtherReceivables	3258000	USD
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	981000	USD
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1496000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1517000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	144263000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	21153000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20599000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	65768000	USD
CY2015	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	10558000	USD
CY2016	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1049000	USD
CY2017	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1752000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	17844000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	33994000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	33337000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Insurance PrepaidInsurance	15041000	USD
CY2017Q4	us-gaap	Prepaid Insurance PrepaidInsurance	10782000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1303000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1373000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1554000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1561000	USD
CY2015	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	12159000	USD
CY2016	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	0	USD
CY2017	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	0	USD
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	153000	USD
CY2016	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	43000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	278000	USD
CY2015	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	0	USD
CY2016	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	124400000	USD
CY2015Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	162184000	USD
CY2017	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	0	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	374000	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	598000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	283115000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	310349000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	80261000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	95659000	USD
CY2015	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2016	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	20000000	USD
CY2017	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	42637000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	41137000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	278163000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	296797000	USD
CY2015	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	18479000	USD
CY2016	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	19288000	USD
CY2017	us-gaap	Sales Commissions And Fees SalesCommissionsAndFees	22773000	USD
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	2603614000	USD
CY2016Q1	us-gaap	Sales Revenue Net SalesRevenueNet	802408000	USD
CY2016Q2	us-gaap	Sales Revenue Net SalesRevenueNet	707332000	USD
CY2016Q3	us-gaap	Sales Revenue Net SalesRevenueNet	702538000	USD
CY2016Q4	us-gaap	Sales Revenue Net SalesRevenueNet	729069000	USD
CY2016	us-gaap	Sales Revenue Net SalesRevenueNet	2941347000	USD
CY2017Q1	us-gaap	Sales Revenue Net SalesRevenueNet	882664000	USD
CY2017Q2	us-gaap	Sales Revenue Net SalesRevenueNet	795552000	USD
CY2017Q3	us-gaap	Sales Revenue Net SalesRevenueNet	795513000	USD
CY2017Q4	us-gaap	Sales Revenue Net SalesRevenueNet	826494000	USD
CY2017	us-gaap	Sales Revenue Net SalesRevenueNet	3300223000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	13345000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	16643000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	24345000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	2300000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2881839	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	16000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	15.30
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	800000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	657000	USD
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	16000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	16000	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	15.30
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	15.30
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	0.00
CY2017	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2	P3Y6M
CY2017Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	4480000	USD
CY2017Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	25778000	USD
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48616000	shares
CY2017Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	42974000	USD
CY2016Q1	us-gaap	Share Price SharePrice	23.75
CY2017Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	657000	USD
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y6M
CY2016	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	202670	shares
CY2017	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	305828	shares
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	48000	shares
CY2016	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	34000	shares
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	38000	shares
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	374000	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	598000	USD
CY2017Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	1000000	shares
CY2017Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	2677564	shares
CY2016Q1	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	6027062	shares
CY2016Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	143100000	USD
CY2016	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	144263000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	204096000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	172455000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	60525000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	66321000	USD
CY2015	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1303000	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1372000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1554000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	13438000	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	14009000	shares
CY2016	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	776126	shares
CY2017	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	594974	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	227152000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	256363000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	67113000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	31669000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	38735000	USD
CY2016Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	61041000	USD
CY2017Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	74632000	USD
CY2017Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	1330000	USD
CY2017Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	11562000	USD
CY2017Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	2430000	USD
CY2017Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	5976000	USD
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41668000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41067000	shares
CY2016Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	44231000	USD
CY2016Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	183928000	USD
CY2017Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	207630000	USD
CY2016Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	141291000	USD
CY2017Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	166493000	USD
CY2017	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;padding-top:0px;text-align:start;padding-left:0px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;color:#000000;font-style:italic;font-weight:normal;text-decoration:none;">New Accounting Pronouncements</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We believe that we have implemented the accounting pronouncements with a material impact on our financial statements.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-04, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment</font><font style="font-family:inherit;font-size:10pt;">. The ASU eliminates the requirement to calculate the implied fair value of goodwill (formerly, Step 2) to measure a goodwill impairment charge. Instead, companies are required to record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (formerly, Step 1). The guidance is effective for goodwill impairment tests in fiscal years beginning after December 16, 2019 and early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. Companies should apply this ASU on a prospective basis. We adopted ASU No. 2017-04 on January 1, 2017.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In February 2016, the FASB issued ASU No. 2016-02, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Leases</font><font style="font-family:inherit;font-size:10pt;">. The new standard requires recognition of lease assets and lease liabilities for leases previously classified as operating leases. The guidance is effective for fiscal years beginning after December 15, 2018. We are currently reviewing the guidance and assessing the impact on our consolidated financial statements.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In May 2014, the FASB issued ASU No. 2014-09, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Revenue from Contracts with Customers (Topic 606)</font><font style="font-family:inherit;font-size:10pt;">. ASU No. 2014-09 outlines a single comprehensive revenue recognition model for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. Under ASU No. 2014-09, an entity recognizes revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2017, and early adoption is permitted. Companies may use either a full retrospective or a modified retrospective approach to adopt ASU No. 2014-09. We plan to adopt ASU No. 2014-09 effective January 1, 2018 using the modified retrospective approach. Under this method, the guidance is applied only to the most current period presented in the financial statements. While our technical analysis is ongoing, we expect our revenue recognition policies to remain substantially unchanged as a result of adopting ASU No. 2014-09. Additionally, we do not anticipate any significant changes in our business processes or systems.</font></div></div>
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;padding-top:0px;text-align:start;padding-left:0px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;color:#000000;font-style:italic;font-weight:normal;text-decoration:none;">Reclassifications</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior year amounts have been reclassified to conform to the </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2017</font><font style="font-family:inherit;font-size:10pt;"> presentation.</font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;padding-top:0px;text-align:start;padding-left:0px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;color:#000000;font-style:italic;font-weight:normal;text-decoration:none;">Use of Estimates</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with United States Generally Accepted Accounting Principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.</font></div></div>

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2017 Q4 Form 10-K Financial Statement

#000100075318000015 Filed on February 12, 2018

Income Statement

Balance Sheet

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Facts In Submission

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$NSP INSPERITY, INC. Stock $nsp

2017 Q4 Form 10-K Financial Statement

#000100075318000015 Filed on February 12, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NSP
INSPERITY, INC. Stock $nsp