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Guarantor Financial Information (Details 3) (USD $) In Thousands, 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
Condensed consolidating financial statements
Total revenue									$ 468,456us-gaap_Revenues	$ 429,215us-gaap_Revenues	$ 423,052us-gaap_Revenues
Costs and expenses									356,817us-gaap_CostsAndExpenses	416,600us-gaap_CostsAndExpenses	343,259us-gaap_CostsAndExpenses
Operating income	(3,244)us-gaap_OperatingIncomeLoss	45,565us-gaap_OperatingIncomeLoss	34,739us-gaap_OperatingIncomeLoss	34,579us-gaap_OperatingIncomeLoss	24,577us-gaap_OperatingIncomeLoss	33,918us-gaap_OperatingIncomeLoss	5,003us-gaap_OperatingIncomeLoss	(50,883)us-gaap_OperatingIncomeLoss	111,639us-gaap_OperatingIncomeLoss	12,615us-gaap_OperatingIncomeLoss	79,793us-gaap_OperatingIncomeLoss
Other income (expense)									(43,071)us-gaap_NonoperatingIncomeExpense	(49,905)us-gaap_NonoperatingIncomeExpense	(22,682)us-gaap_NonoperatingIncomeExpense
Equity in earnings of subsidiaries									0	0	0
Income tax (expense) benefit									(24,687)us-gaap_IncomeTaxExpenseBenefit	12,428us-gaap_IncomeTaxExpenseBenefit	(22,008)us-gaap_IncomeTaxExpenseBenefit
NET INCOME (LOSS)									43,881	(24,862)	35,103
Issuer
Condensed consolidating financial statements
Total revenue									324,055	280,423	291,782
Costs and expenses									242,658	302,898	230,033
Operating income									81,397	(22,475)	61,749
Other income (expense)									(45,538)	(50,601)	(25,495)
Equity in earnings of subsidiaries									21,261	23,261	13,557
Income tax (expense) benefit									(13,239)	24,953	(14,708)
NET INCOME (LOSS)									43,881	(24,862)	35,103
Guarantor Subsidiaries
Condensed consolidating financial statements
Total revenue									140,857	146,556	132,690
Costs and expenses									111,750	112,441	114,646
Operating income									29,107	34,115	18,044
Other income (expense)									919	(25)	2,813
Equity in earnings of subsidiaries									0	0	0
Income tax (expense) benefit									(10,509)	(11,931)	(7,300)
NET INCOME (LOSS)									19,517	22,159	13,557
Non-Guarantor Subsidiary
Condensed consolidating financial statements
Total revenue									3,544	2,236	0
Costs and expenses									2,409	1,261	0
Operating income									1,135	975	0
Other income (expense)									1,548	721	0
Equity in earnings of subsidiaries									0	0	0
Income tax (expense) benefit									(939)	(594)	0
NET INCOME (LOSS)									1,744	1,102	0
Adjustments/ Eliminations
Condensed consolidating financial statements
Total revenue									0	0	(1,420)
Costs and expenses									0	0	(1,420)
Operating income									0	0	0
Other income (expense)									0	0	0
Equity in earnings of subsidiaries									(21,261)	(23,261)	(13,557)
Income tax (expense) benefit									0	0	0
NET INCOME (LOSS)									$ (21,261)	$ (23,261)	$ (13,557)