Debt Including Capital Lease Obligations - 7.875% Senior Secured Notes (Details) (7.875% Senior Notes, USD $)						0 Months Ended
	Mar. 31, 2014 Senior notes	Dec. 31, 2013 Senior notes	Mar. 31, 2013 Senior notes	Feb. 28, 2013 Senior notes	Feb. 05, 2013 Senior notes	Jan. 31, 2014 Senior notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.875%	7.875%	7.875%	7.875%	7.875%
Principal amount of debt component				$ 425,000,000
Debt discount rate				99.274%
Effective interest rate				8.00%
Extinguishment of Debt, Amount						10,000,000
Redemption price percentage						103.00%
Extinguishment of Debt, Debt Extinguishment Costs						$ 1,000,000