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Summarized Quarterly Financial Data (Unaudited) (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
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 116,070 us-gaap_SalesRevenueServicesNet | $ 100,756 us-gaap_SalesRevenueServicesNet | $ 112,747 us-gaap_SalesRevenueServicesNet | $ 116,468 us-gaap_SalesRevenueServicesNet | $ 124,083 us-gaap_SalesRevenueServicesNet | $ 110,031 us-gaap_SalesRevenueServicesNet | $ 131,980 us-gaap_SalesRevenueServicesNet | $ 137,506 us-gaap_SalesRevenueServicesNet | $ 446,041 us-gaap_SalesRevenueServicesNet | $ 503,600 us-gaap_SalesRevenueServicesNet | $ 561,979 us-gaap_SalesRevenueServicesNet
Income (loss) from operations | 22,624 us-gaap_OperatingIncomeLoss | 9,216 us-gaap_OperatingIncomeLoss | 23,998 us-gaap_OperatingIncomeLoss | 25,909 us-gaap_OperatingIncomeLoss | (30,096)us-gaap_OperatingIncomeLoss | 6,621 us-gaap_OperatingIncomeLoss | 26,257 us-gaap_OperatingIncomeLoss | 29,919 us-gaap_OperatingIncomeLoss | 81,747 us-gaap_OperatingIncomeLoss | 32,701 us-gaap_OperatingIncomeLoss | 113,587 us-gaap_OperatingIncomeLoss
Net income (loss) | $ 12,943 us-gaap_NetIncomeLoss | $ 4,953 us-gaap_NetIncomeLoss | $ 13,677 us-gaap_NetIncomeLoss | $ 14,783 us-gaap_NetIncomeLoss | $ (18,957)us-gaap_NetIncomeLoss | $ 3,149 us-gaap_NetIncomeLoss | $ 15,002 us-gaap_NetIncomeLoss | $ 17,231 us-gaap_NetIncomeLoss | $ 46,356 us-gaap_NetIncomeLoss | $ 16,425 us-gaap_NetIncomeLoss | $ 65,930 us-gaap_NetIncomeLoss
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 1.22 us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic | $ 1.29 us-gaap_EarningsPerShareBasic | $ 1.40 us-gaap_EarningsPerShareBasic | $ (1.80)us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 1.43 us-gaap_EarningsPerShareBasic | $ 1.59 us-gaap_EarningsPerShareBasic | $ 4.39 us-gaap_EarningsPerShareBasic | $ 1.55 us-gaap_EarningsPerShareBasic | $ 5.79 us-gaap_EarningsPerShareBasic
Diluted | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 1.29 us-gaap_EarningsPerShareDiluted | $ 1.40 us-gaap_EarningsPerShareDiluted | $ (1.80)us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 1.42 us-gaap_EarningsPerShareDiluted | $ 1.59 us-gaap_EarningsPerShareDiluted | $ 4.35 us-gaap_EarningsPerShareDiluted | $ 1.55 us-gaap_EarningsPerShareDiluted | $ 5.76 us-gaap_EarningsPerShareDiluted

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