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Consolidated Statements of Income (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenues, net $ 143,510us-gaap_SalesRevenueServicesNet $ 121,797us-gaap_SalesRevenueServicesNet
Cost of revenues (exclusive of depreciation and amortization) 93,125us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization 74,922us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization
Gross profit 50,385us-gaap_GrossProfit 46,875us-gaap_GrossProfit
Operating expenses:    
General and administrative expenses 18,621us-gaap_GeneralAndAdministrativeExpense 14,800us-gaap_GeneralAndAdministrativeExpense
Selling and marketing expenses 11,243us-gaap_SellingAndMarketingExpense 10,232us-gaap_SellingAndMarketingExpense
Depreciation and amortization 7,053us-gaap_DepreciationDepletionAndAmortization 6,356us-gaap_DepreciationDepletionAndAmortization
Total operating expenses 36,917us-gaap_OperatingExpenses 31,388us-gaap_OperatingExpenses
Income from operations 13,468us-gaap_OperatingIncomeLoss 15,487us-gaap_OperatingIncomeLoss
Foreign exchange income / (loss) 1,134us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (833)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other income, net 1,178us-gaap_OtherNonoperatingIncomeExpense 958us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes 15,780us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 15,612us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense 6,213us-gaap_IncomeTaxExpenseBenefit 4,465us-gaap_IncomeTaxExpenseBenefit
Net income $ 9,567us-gaap_NetIncomeLoss $ 11,147us-gaap_NetIncomeLoss
Earnings per share:    
Basic $ 0.29us-gaap_EarningsPerShareBasic $ 0.34us-gaap_EarningsPerShareBasic
Diluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.33us-gaap_EarningsPerShareDiluted
Weighted-average number of shares used in computing earnings per share:    
Basic 33,236,259us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,523,490us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 34,051,971us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 33,428,544us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding