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Consolidated Statements Of Comprehensive Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenues $ 355,246us-gaap_SalesRevenueServicesNet $ 312,165us-gaap_SalesRevenueServicesNet
Operating costs and expenses:    
Costs of services provided 303,936us-gaap_CostOfServices 267,371us-gaap_CostOfServices
Selling, general and administrative 26,763us-gaap_SellingGeneralAndAdministrativeExpense 22,046us-gaap_SellingGeneralAndAdministrativeExpense
Other income:    
Investment and interest 507us-gaap_InvestmentIncomeNonoperating 381us-gaap_InvestmentIncomeNonoperating
Income before income taxes 25,054us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 23,129us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision 9,538us-gaap_IncomeTaxExpenseBenefit 8,490us-gaap_IncomeTaxExpenseBenefit
Net income 15,516us-gaap_NetIncomeLoss 14,639us-gaap_NetIncomeLoss
Per share data:    
Basic earnings (loss) per common share (dollars per share) $ 0.22us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per common share (dollars per share) $ 0.22us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding:    
Basic (shares) 71,469us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 70,321us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (shares) 72,159us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 71,072us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Comprehensive income:    
Net income 15,516us-gaap_NetIncomeLoss 14,639us-gaap_NetIncomeLoss
Other comprehensive income:    
Unrealized gain on available for sale marketable securities, net of taxes 3us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1] 1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total comprehensive income $ 15,519us-gaap_ComprehensiveIncomeNetOfTax $ 14,640us-gaap_ComprehensiveIncomeNetOfTax
[1] All amounts are net of tax.