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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 77,316us-gaap_CashAndCashEquivalentsAtCarryingValue $ 158,017us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 276,432us-gaap_AccountsReceivableNetCurrent 236,099us-gaap_AccountsReceivableNetCurrent
Prepaids and other current assets 64,702us-gaap_PrepaidExpenseAndOtherAssets 52,332us-gaap_PrepaidExpenseAndOtherAssets
Deferred tax assets, net 22,501us-gaap_DeferredTaxAssetsNetCurrent 11,905us-gaap_DeferredTaxAssetsNetCurrent
Income tax receivable 4,532us-gaap_IncomeTaxesReceivable 11,198us-gaap_IncomeTaxesReceivable
Total current assets 445,483us-gaap_AssetsCurrent 469,551us-gaap_AssetsCurrent
Long-term assets    
Property, plant and equipment, net 150,212us-gaap_PropertyPlantAndEquipmentNet 126,719us-gaap_PropertyPlantAndEquipmentNet
Goodwill 128,705us-gaap_Goodwill 102,743us-gaap_Goodwill
Deferred tax assets, net 31,512us-gaap_DeferredTaxAssetsNetNoncurrent 42,791us-gaap_DeferredTaxAssetsNetNoncurrent
Other intangible assets, net 59,905us-gaap_OtherIntangibleAssetsNet 54,812us-gaap_OtherIntangibleAssetsNet
Other long-term assets 36,658us-gaap_OtherAssetsNoncurrent 45,726us-gaap_OtherAssetsNoncurrent
Total long-term assets 406,992us-gaap_AssetsNoncurrent 372,791us-gaap_AssetsNoncurrent
Total assets 852,475us-gaap_Assets 842,342us-gaap_Assets
Current liabilities    
Accounts payable 37,019us-gaap_AccountsPayableCurrent 32,031us-gaap_AccountsPayableCurrent
Accrued employee compensation and benefits 70,069us-gaap_EmployeeRelatedLiabilitiesCurrent 80,130us-gaap_EmployeeRelatedLiabilitiesCurrent
Other accrued expenses 34,430us-gaap_AccruedLiabilitiesCurrent 31,659us-gaap_AccruedLiabilitiesCurrent
Income tax payable 10,141us-gaap_AccruedIncomeTaxesCurrent 6,066us-gaap_AccruedIncomeTaxesCurrent
Deferred tax liabilities, net 0us-gaap_DeferredTaxLiabilitiesCurrent 590us-gaap_DeferredTaxLiabilitiesCurrent
Deferred revenue 29,887us-gaap_DeferredRevenueCurrent 28,799us-gaap_DeferredRevenueCurrent
Other current liabilities 17,085us-gaap_OtherLiabilitiesCurrent 11,512us-gaap_OtherLiabilitiesCurrent
Total current liabilities 198,631us-gaap_LiabilitiesCurrent 190,787us-gaap_LiabilitiesCurrent
Long-term liabilities    
Line of credit 100,000us-gaap_LongTermLineOfCredit 100,000us-gaap_LongTermLineOfCredit
Deferred tax liabilities, net 4,675us-gaap_DeferredTaxLiabilitiesNoncurrent 2,281us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred rent 8,956us-gaap_DeferredRentCredit 9,635us-gaap_DeferredRentCredit
Other long-term liabilities 74,149us-gaap_OtherLiabilitiesNoncurrent 63,648us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 187,780us-gaap_LiabilitiesNoncurrent 175,564us-gaap_LiabilitiesNoncurrent
Total liabilities 386,411us-gaap_Liabilities 366,351us-gaap_Liabilities
Commitments and contingencies (Note 15)      
Manditorily redeemable noncontrolling interest 2,814us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount 2,509us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
Stockholders' equity    
Preferred stock - $0.01 par value: 10,000,000 shares authorized; zero shares outstanding as of December 31, 2014 and December 31, 2013 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock - $0.01 par value; 150,000,000 shares authorized; 48,452,852 and 50,352,881 shares outstanding as of December 31, 2014 and December 31, 2013, respectively 485us-gaap_CommonStockValueOutstanding 503us-gaap_CommonStockValueOutstanding
Additional paid-in capital 356,792us-gaap_AdditionalPaidInCapital 356,381us-gaap_AdditionalPaidInCapital
Treasury stock at cost: 33,599,401 and 31,699,372 shares as of December 31, 2014 and December 31, 2013, respectively (527,595)us-gaap_TreasuryStockValue (477,399)us-gaap_TreasuryStockValue
Accumulated other comprehensive income (loss) (52,274)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (20,586)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 677,859us-gaap_RetainedEarningsAccumulatedDeficit 606,502us-gaap_RetainedEarningsAccumulatedDeficit
Noncontrolling interest 7,983us-gaap_MinorityInterest 8,081us-gaap_MinorityInterest
Total stockholders' equity 463,250us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 473,482us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and stockholders' equity $ 852,475us-gaap_LiabilitiesAndStockholdersEquity $ 842,342us-gaap_LiabilitiesAndStockholdersEquity