Debt - Inputs Used In Lattice Model (Details) (Notes [Member], Notes Due February 1, 2033 [Member], USD $)	0 Months Ended	1 Months Ended	3 Months Ended
	Aug. 29, 2013	Jan. 30, 2013 Rate	Mar. 31, 2014 Rate
Notes [Member] | Notes Due February 1, 2033 [Member]
Debt Instrument [Line Items]
Share price		$ 6.20	$ 9.32
Conversion Rate	141.4827	141.4827	141.4827
Conversion Price		$ 7.07	$ 7.07
Maturity date		Feb. 01, 2033	Feb. 01, 2033
Risk-free interest rate		1.12%	1.66%
Estimated stock volatility		40.00%	50.00%
Estimated credit spread		9.44%	8.23%