Related Party Transactions (Details) - USD ($) $ in Thousands			12 Months Ended
	Oct. 11, 2013	Oct. 30, 2008	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2010
Related party transactions
Cash paid for preferred stock					$ 649,518
Series C Preferred Stock
Related party transactions
Repurchase of Preferred Stock (in shares)					5,929
Series C Preferred Stock | Affiliate of Fortress Investment Group LLC
Related party transactions
Issuance of preferred stock (in shares)	14,553
Repurchase of Preferred Stock (in shares)	5,929
Cash paid for preferred stock	$ 397,200
Series B Preferred Stock
Related party transactions
Issuance of preferred stock (in shares)		12,500
Repurchase of Preferred Stock (in shares)					2,525	225
Series B Preferred Stock | Centerbridge Partners LP
Related party transactions
Repurchase of Preferred Stock (in shares)	2,300
Cash paid for preferred stock	$ 230,000
Series B Preferred Stock | Affiliate of Fortress Investment Group LLC
Related party transactions
Repurchase of Preferred Stock (in shares)	9,750
Affiliates of Entity Chairman
Related party transactions
Rent expense			$ 1,200	$ 1,100	$ 1,100
Future minimum lease commitments relating to leases			$ 4,100