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

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