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Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 202,774 us-gaap_Revenues | $ 175,000 us-gaap_Revenues | $ 165,326 us-gaap_Revenues | $ 169,777 us-gaap_Revenues | $ 185,203 us-gaap_Revenues | $ 173,379 us-gaap_Revenues | $ 142,354 us-gaap_Revenues | $ 159,912 us-gaap_Revenues | $ 712,877 us-gaap_Revenues | $ 660,848 us-gaap_Revenues | $ 592,091 us-gaap_Revenues
Cost of revenue | 91,141 us-gaap_CostOfRevenue | 76,137 us-gaap_CostOfRevenue | 71,405 us-gaap_CostOfRevenue | 73,321 us-gaap_CostOfRevenue | 85,011 us-gaap_CostOfRevenue | 79,404 us-gaap_CostOfRevenue | 58,207 us-gaap_CostOfRevenue | 68,652 us-gaap_CostOfRevenue | 312,004 us-gaap_CostOfRevenue | 291,274 us-gaap_CostOfRevenue | 256,553 us-gaap_CostOfRevenue
Net revenue | 111,633 us-gaap_GrossProfit | 98,863 us-gaap_GrossProfit | 93,921 us-gaap_GrossProfit | 96,456 us-gaap_GrossProfit | 100,192 us-gaap_GrossProfit | 93,975 us-gaap_GrossProfit | 84,147 us-gaap_GrossProfit | 91,260 us-gaap_GrossProfit | 400,873 us-gaap_GrossProfit | 369,574 us-gaap_GrossProfit | 335,538 us-gaap_GrossProfit
Total expenses and other income | 74,940 us-gaap_OperatingExpenses | 70,983 us-gaap_OperatingExpenses | 70,522 us-gaap_OperatingExpenses | 67,448 us-gaap_OperatingExpenses | 64,377 us-gaap_OperatingExpenses | 64,524 us-gaap_OperatingExpenses | 60,387 us-gaap_OperatingExpenses | 60,094 us-gaap_OperatingExpenses | 283,893 us-gaap_OperatingExpenses | 249,382 us-gaap_OperatingExpenses | 213,301 us-gaap_OperatingExpenses
Income from continuing operations | 26,941 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 19,528 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 16,015 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 22,954 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 25,518 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 23,127 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 15,654 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 20,180 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 85,438 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 84,479 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 80,862 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from discontinued operations, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (272)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (740)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 9 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 84 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (272)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (633)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (503)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income | $ 26,941 us-gaap_NetIncomeLoss | $ 19,528 us-gaap_NetIncomeLoss | $ 16,015 us-gaap_NetIncomeLoss | $ 22,682 us-gaap_NetIncomeLoss | $ 24,778 us-gaap_NetIncomeLoss | $ 23,141 us-gaap_NetIncomeLoss | $ 15,663 us-gaap_NetIncomeLoss | $ 20,264 us-gaap_NetIncomeLoss | $ 85,166 us-gaap_NetIncomeLoss | $ 83,846 us-gaap_NetIncomeLoss | $ 80,359 us-gaap_NetIncomeLoss
Diluted income per share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax (diluted) (in dollars per share) | $ 0.94 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.68 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.55 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.78 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.87 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.79 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.53 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.68 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.94 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.86 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.72 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income (loss) from discontinued operations, net of tax (diluted) (in dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income per diluted share (in dollars per share) | $ 0.94 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted | $ 0.55 us-gaap_EarningsPerShareDiluted | $ 0.77 us-gaap_EarningsPerShareDiluted | $ 0.84 us-gaap_EarningsPerShareDiluted | $ 0.79 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted | $ 2.93 us-gaap_EarningsPerShareDiluted | $ 2.84 us-gaap_EarningsPerShareDiluted | $ 2.70 us-gaap_EarningsPerShareDiluted
Diluted weighted average shares | 28,804 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,805 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,341 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,342 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,393 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,353 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,603 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,955 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,070 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,574 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,713 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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