Subsequent Events - Narrative (Details) (USD $)	0 Months Ended				3 Months Ended		9 Months Ended			0 Months Ended							0 Months Ended	1 Months Ended		0 Months Ended
	Sep. 28, 2014	Aug. 04, 2014	May 28, 2014	Feb. 25, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Oct. 27, 2014 Subsequent Event	Sep. 30, 2014 Senior Secured Credit Facility, due Oct 2017, variable rate 3.75%	Sep. 28, 2014 Senior Secured Credit Facility, due Oct 2017, variable rate 3.75%	Dec. 31, 2013 Senior Secured Credit Facility, due Oct 2017, variable rate 3.75%	Sep. 30, 2014 Senior Notes due Oct 2018, at a fixed rate 9.5%	Sep. 28, 2014 Senior Notes due Oct 2018, at a fixed rate 9.5%	Dec. 31, 2013 Senior Notes due Oct 2018, at a fixed rate 9.5%	Oct. 27, 2014 October 2014 Share Repurchase Program Subsequent Event	Feb. 28, 2013 February 2013 Share Repurchase Program	Sep. 30, 2014 February 2013 Share Repurchase Program	Sep. 30, 2014 Secured Debt Class A-2 Fixed Rate Senior Secured Notes, Fixed Rate 4.277% Subsequent Event	Sep. 30, 2014 Secured Debt Class A-1 Variable Rate Senior Notes Subsequent Event
Subsequent Event [Line Items]
Securitized debt outstanding																				$ 1,300,000,000
Debt interest rate (percent)											3.75%		3.75%	9.50%	9.50%	9.50%				4.277%
Debt maturity term																				7 years
Maximum borrowing capacity																					100,000,000
Senior secured credit facility due											463,600,000	463,600,000	467,200,000
Repayment of debt	833,000,000
Senior Notes due October 2018, at a fixed rate of 9.5%														760,800,000	760,800,000	760,800,000
Accrued interest payable	36,000,000				31,618,000		31,618,000		13,575,000
Payments of debt costs	36,000,000
Dividends declared per common share		$ 0.75	$ 0.75	$ 0.75	$ 0.75	$ 0.75	$ 2.25	$ 2.25		$ 0.875
Stock Repurchase Program, Authorized Amount																	100,000,000	100,000,000
Cumulative payments for repurchase of common stock																			$ 59,700,000