Tender Offer and Stock Repurchase - Warrant Activity (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Jul. 01, 2013
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		24,341
Exercised (in shares)		(158)
Repurchased (in shares)	(2,600)	(2,578)
Warrants - Outstanding at end of period (in shares)	21,605	21,605
Class A
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)	$ 11.70	$ 11.70	$ 12.00
Initial term (years)		4 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		8,114
Exercised (in shares)		(158)
Repurchased (in shares)		(859)
Warrants - Outstanding at end of period (in shares)	7,097	7,097
Class B
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)	$ 13.16	$ 13.16	13.50
Initial term (years)		5 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		8,114
Exercised (in shares)		0
Repurchased (in shares)		(859)
Warrants - Outstanding at end of period (in shares)	7,254	7,254
Class C
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)	$ 14.63	$ 14.63	$ 15.00
Initial term (years)		6 years
Class of Warrant or Right [Roll Forward]
Warrants - Outstanding at beginning of period (in shares)		8,113
Exercised (in shares)		0
Repurchased (in shares)		(859)
Warrants - Outstanding at end of period (in shares)	7,254	7,254