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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Revenues $ 1,293,183us-gaap_SalesRevenueServicesNet $ 1,149,890us-gaap_SalesRevenueServicesNet $ 1,077,435us-gaap_SalesRevenueServicesNet
Operating costs and expenses:      
Costs of services provided 1,155,293us-gaap_CostOfServices 995,104us-gaap_CostOfServices 930,814us-gaap_CostOfServices
Selling, general and administrative 107,810us-gaap_SellingGeneralAndAdministrativeExpense 91,998us-gaap_SellingGeneralAndAdministrativeExpense 79,277us-gaap_SellingGeneralAndAdministrativeExpense
Other income:      
Investment and interest 1,628us-gaap_InvestmentIncomeNonoperating 3,701us-gaap_InvestmentIncomeNonoperating 2,920us-gaap_InvestmentIncomeNonoperating
Income before income taxes 31,708us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 66,489us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 70,264us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income taxes 9,858us-gaap_IncomeTaxExpenseBenefit 19,360us-gaap_IncomeTaxExpenseBenefit 26,050us-gaap_IncomeTaxExpenseBenefit
Net income 21,850us-gaap_NetIncomeLoss 47,129us-gaap_NetIncomeLoss 44,214us-gaap_NetIncomeLoss
Per share data:      
Basic earnings per common share (in dollars per share) $ 0.31us-gaap_EarningsPerShareBasic $ 0.68us-gaap_EarningsPerShareBasic $ 0.65us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share) $ 0.31us-gaap_EarningsPerShareDiluted $ 0.67us-gaap_EarningsPerShareDiluted $ 0.65us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding:      
Basic (in shares) 70,616us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 69,206us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 67,511us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 71,341us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 70,045us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 68,485us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Comprehensive income:      
Net income 21,850us-gaap_NetIncomeLoss 47,129us-gaap_NetIncomeLoss 44,214us-gaap_NetIncomeLoss
Other comprehensive income:      
Unrealized loss on available for sale marketable securities, net of taxes (24)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1] (78)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (216)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total comprehensive income $ 21,826us-gaap_ComprehensiveIncomeNetOfTax $ 47,051us-gaap_ComprehensiveIncomeNetOfTax $ 43,998us-gaap_ComprehensiveIncomeNetOfTax
[1] All amounts are net of tax.