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

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