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

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