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CONSOLIDATED STATEMENTS OF INCOME AND 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 | $ 730,027 us-gaap_SalesRevenueNet | $ 555,117 us-gaap_SalesRevenueNet | $ 433,799 us-gaap_SalesRevenueNet
Operating expenses: |  |  |
Cost of revenues (exclusive of depreciation and amortization) | 456,530 us-gaap_CostOfRevenue | 347,650 us-gaap_CostOfRevenue | 270,361 us-gaap_CostOfRevenue
Selling, general and administrative expenses | 163,666 us-gaap_SellingGeneralAndAdministrativeExpense | 116,497 us-gaap_SellingGeneralAndAdministrativeExpense | 85,868 us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization expense | 17,483 us-gaap_DepreciationAndAmortization | 15,120 us-gaap_DepreciationAndAmortization | 10,882 us-gaap_DepreciationAndAmortization
Goodwill impairment loss | 2,241 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
Other operating expenses/(income), net | 3,924 us-gaap_OtherOperatingIncomeExpenseNet | (643)us-gaap_OtherOperatingIncomeExpenseNet | 682 us-gaap_OtherOperatingIncomeExpenseNet
Income from operations | 86,183 us-gaap_OperatingIncomeLoss | 76,493 us-gaap_OperatingIncomeLoss | 66,006 us-gaap_OperatingIncomeLoss
Interest and other income, net | 4,769 us-gaap_InvestmentIncomeNet | 3,077 us-gaap_InvestmentIncomeNet | 1,941 us-gaap_InvestmentIncomeNet
Change in fair value of contingent consideration | (1,924)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Foreign exchange loss | (2,075)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (2,800)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (2,084)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Income before provision for income taxes | 86,953 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 76,770 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 65,863 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes | 17,312 us-gaap_IncomeTaxExpenseBenefit | 14,776 us-gaap_IncomeTaxExpenseBenefit | 11,379 us-gaap_IncomeTaxExpenseBenefit
Net income | 69,641 us-gaap_NetIncomeLoss | 61,994 us-gaap_NetIncomeLoss | 54,484 us-gaap_NetIncomeLoss
Foreign currency translation adjustments | (20,251)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | (811)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 2,493 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive income | 49,390 us-gaap_ComprehensiveIncomeNetOfTax | 61,183 us-gaap_ComprehensiveIncomeNetOfTax | 56,977 us-gaap_ComprehensiveIncomeNetOfTax
Net income allocated to participating securities | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (3,341)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Numerator for basic earnings per share | $ 69,641 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 61,994 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 51,143 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income per share: |  |  |
Basic (in dollars per share) | $ 1.48 us-gaap_EarningsPerShareBasic | $ 1.35 us-gaap_EarningsPerShareBasic | $ 1.27 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 1.40 us-gaap_EarningsPerShareDiluted | $ 1.28 us-gaap_EarningsPerShareDiluted | $ 1.17 us-gaap_EarningsPerShareDiluted
Shares used in calculation of net income per share: |  |  |
Basic (in shares) | 47,189 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 45,754 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 40,190 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 49,734 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,358 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 43,821 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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