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Quarterly Results of Operations (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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 283,110us-gaap_Revenues $ 273,267us-gaap_Revenues $ 259,812us-gaap_Revenues $ 239,034us-gaap_Revenues $ 238,183us-gaap_Revenues $ 243,979us-gaap_Revenues $ 248,354us-gaap_Revenues $ 229,670us-gaap_Revenues $ 1,055,223us-gaap_Revenues $ 960,186us-gaap_Revenues $ 919,443us-gaap_Revenues
Income (loss) from operations (48,672)us-gaap_OperatingIncomeLoss 32,804us-gaap_OperatingIncomeLoss 21,917us-gaap_OperatingIncomeLoss 17,935us-gaap_OperatingIncomeLoss 8,724us-gaap_OperatingIncomeLoss 1,870us-gaap_OperatingIncomeLoss (27,268)us-gaap_OperatingIncomeLoss 10,445us-gaap_OperatingIncomeLoss 23,984us-gaap_OperatingIncomeLoss (6,229)us-gaap_OperatingIncomeLoss 81,811us-gaap_OperatingIncomeLoss
Income tax (expense) benefit 20,198us-gaap_IncomeTaxExpenseBenefit (9,927)us-gaap_IncomeTaxExpenseBenefit 1,070us-gaap_IncomeTaxExpenseBenefit (37)us-gaap_IncomeTaxExpenseBenefit 733us-gaap_IncomeTaxExpenseBenefit 3,614us-gaap_IncomeTaxExpenseBenefit 14,953us-gaap_IncomeTaxExpenseBenefit 546us-gaap_IncomeTaxExpenseBenefit 11,304us-gaap_IncomeTaxExpenseBenefit 19,846us-gaap_IncomeTaxExpenseBenefit (16,354)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) $ (47,573)us-gaap_NetIncomeLoss $ 12,453us-gaap_NetIncomeLoss $ (319)us-gaap_NetIncomeLoss $ (2,579)us-gaap_NetIncomeLoss $ (2,515)us-gaap_NetIncomeLoss $ (6,230)us-gaap_NetIncomeLoss $ (25,895)us-gaap_NetIncomeLoss $ (1,292)us-gaap_NetIncomeLoss $ (38,018)us-gaap_NetIncomeLoss $ (35,932)us-gaap_NetIncomeLoss $ 30,032us-gaap_NetIncomeLoss
Earnings (loss) per share:                      
Income (loss) per common share - Basic $ (0.75)us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic $ (0.04)us-gaap_EarningsPerShareBasic $ (0.04)us-gaap_EarningsPerShareBasic $ (0.10)us-gaap_EarningsPerShareBasic $ (0.42)us-gaap_EarningsPerShareBasic $ (0.02)us-gaap_EarningsPerShareBasic $ (0.60)us-gaap_EarningsPerShareBasic $ (0.58)us-gaap_EarningsPerShareBasic $ 0.49us-gaap_EarningsPerShareBasic
Income (loss) per common share - Diluted (USD per share) $ (0.75)us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted $ (0.10)us-gaap_EarningsPerShareDiluted $ (0.42)us-gaap_EarningsPerShareDiluted $ (0.02)us-gaap_EarningsPerShareDiluted $ (0.60)us-gaap_EarningsPerShareDiluted $ (0.58)us-gaap_EarningsPerShareDiluted $ 0.48us-gaap_EarningsPerShareDiluted