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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
Schedule Of Quarterly Financial Information [Line Items]
Revenues	$ 250,979us-gaap_SalesRevenueServicesNet	$ 248,473us-gaap_SalesRevenueServicesNet	$ 228,877us-gaap_SalesRevenueServicesNet	$ 215,638us-gaap_SalesRevenueServicesNet	$ 254,581us-gaap_SalesRevenueServicesNet	$ 232,890us-gaap_SalesRevenueServicesNet	$ 213,916us-gaap_SalesRevenueServicesNet	$ 201,342us-gaap_SalesRevenueServicesNet	$ 943,967us-gaap_SalesRevenueServicesNet	$ 902,729us-gaap_SalesRevenueServicesNet	$ 998,959us-gaap_SalesRevenueServicesNet
Gross profit	42,082us-gaap_GrossProfit	32,724us-gaap_GrossProfit	30,528us-gaap_GrossProfit	27,080us-gaap_GrossProfit	33,838us-gaap_GrossProfit	32,483us-gaap_GrossProfit	31,253us-gaap_GrossProfit	27,303us-gaap_GrossProfit	132,414us-gaap_GrossProfit	124,877us-gaap_GrossProfit	118,653us-gaap_GrossProfit
Net income	$ 14,127us-gaap_NetIncomeLoss	$ 8,404us-gaap_NetIncomeLoss	$ 7,741us-gaap_NetIncomeLoss	$ 6,272us-gaap_NetIncomeLoss	$ 10,022us-gaap_NetIncomeLoss	$ 8,315us-gaap_NetIncomeLoss	$ 9,462us-gaap_NetIncomeLoss	$ 6,960us-gaap_NetIncomeLoss	$ 36,544us-gaap_NetIncomeLoss	$ 34,759us-gaap_NetIncomeLoss	$ 34,262us-gaap_NetIncomeLoss
Basic earnings per share (in dollars per share)	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 1.73us-gaap_EarningsPerShareBasic	$ 1.65us-gaap_EarningsPerShareBasic	$ 1.67us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 0.66us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 1.69us-gaap_EarningsPerShareDiluted	$ 1.61us-gaap_EarningsPerShareDiluted	$ 1.60us-gaap_EarningsPerShareDiluted

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