Schedule I Condensed Parent Company Financial Statements (Details 4) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities
Net income (loss)	$ 24,000	$ 60,265	$ (75,192)	$ (78,909)	$ 128,771	$ 19,123	$ 56,507	$ 74,969	$ (69,836)	$ 279,370	$ (91,044)
Financing activities
Cash and cash equivalents at beginning of period				554,831				598,108	554,831	598,108	515,164
Cash and cash equivalents at end of period	275,004				554,831				275,004	554,831	598,108
Parent company
Operating activities
Net income (loss)									(69,836)	279,370	(91,044)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity in (earnings) losses of subsidiaries									7,464	(311,157)	64,552
Equity-based compensation									75,267	79,741	69,101
Amortization									3,190	3,188	3,017
Other									2,704	269
Changes in assets and liabilities:
(Increase) decrease in prepaid expenses and other									(34)	89	(149)
(Increase) decrease due to/from related party									1,224	(3,915)	4,134
Increase in accounts payable and accrued liabilities									2,721	10,593	794
Net cash provided by operating activities									22,700	58,178	50,405
Investing activities
Investment in subsidiaries									(293,545)	(208,879)	(133,066)
Net cash used in investing activities									(293,545)	(208,879)	(133,066)
Financing activities
Net proceeds from issuance of senior secured notes									206,774	294,000
Purchase of treasury stock									(18,110)	(11,096)	(13,101)
Deferred financing costs									(9,030)	(1,401)	(1,720)
Net cash provided by (used in) financing activities									179,634	281,503	(14,821)
Net increase (decrease) in cash and cash equivalents									(91,211)	130,802	(97,482)
Cash and cash equivalents at beginning of period				$ 165,894				$ 35,092	165,894	35,092	132,574
Cash and cash equivalents at end of period	$ 74,683				$ 165,894				$ 74,683	$ 165,894	$ 35,092