Debt Including Capital Lease Obligations - Asset-Based Lending Facility (Details) (USD $)	0 Months Ended	6 Months Ended																6 Months Ended
	Feb. 05, 2013 ABL Facility	Jun. 30, 2014 ABL Facility	Jun. 30, 2014 ABL Facility LIBOR	Jun. 30, 2014 ABL Facility LIBOR Minimum	Jun. 30, 2014 ABL Facility LIBOR Maximum	Jun. 30, 2014 ABL Facility Base Rate	Jun. 30, 2014 ABL Facility Base Rate Minimum	Jun. 30, 2014 ABL Facility Base Rate Maximum	Jun. 30, 2014 ABL Facility fixed charge coverage ratio [Domain]	Jun. 30, 2014 ABL Term Loan	Jun. 30, 2014 ABL Term Loan LIBOR	Jun. 30, 2014 ABL Term Loan LIBOR Minimum	Jun. 30, 2014 ABL Term Loan LIBOR Maximum	Jun. 30, 2014 ABL Term Loan Base Rate	Jun. 30, 2014 ABL Term Loan Base Rate Minimum	Jun. 30, 2014 ABL Term Loan Base Rate Maximum	Jun. 30, 2014 ABL Revolver	Jun. 30, 2014 Fixed asset sub-line LIBOR	Jun. 30, 2014 Fixed asset sub-line LIBOR Minimum	Jun. 30, 2014 Fixed asset sub-line LIBOR Maximum	Jun. 30, 2014 Fixed asset sub-line Base Rate	Jun. 30, 2014 Fixed asset sub-line Base Rate Minimum	Jun. 30, 2014 Fixed asset sub-line Base Rate Maximum	Jun. 30, 2014 ABL Facility, letter of credit	Jun. 30, 2014 Senior notes 7.875% Senior Notes	Dec. 31, 2013 Senior notes 7.875% Senior Notes	Jun. 30, 2013 Senior notes 7.875% Senior Notes	Feb. 28, 2013 Senior notes 7.875% Senior Notes	Feb. 05, 2013 Senior notes 7.875% Senior Notes
Line of Credit Facility [Line Items]
ABL Facility term	5 years
Stated interest rate on debt instrument																									7.875%	7.875%	7.875%	7.875%	7.875%
ABL Facility maturity period prior to maturity of the 4.25% Convertible Senior Notes		60 days
ABL maximum borrowings capacity		$ 150,000,000								$ 7,500,000
ABL Term Loan periodic payment										2,000,000
ABL amount outstanding																								24,000,000
Remaining borrowing capacity of the Facility																	$ 92,000,000
Variable rate basis		LIBOR	LIBOR			Base Rate					LIBOR			Base Rate				LIBOR			Base Rate
Basis spread on variable rate			2.75%	1.75%	2.25%		0.25%	0.75%				2.75%	3.25%		1.25%	1.75%			2.25%	2.75%		0.75%	1.25%
Weighted average interest rate			2.90%
Line of Credit Facility, Covenant Terms		25							20