Subsequent Events (Details) (USD $)	1 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended			12 Months Ended				0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2007	Apr. 30, 2007 Secured debt	Apr. 30, 2007 Secured debt LIBOR Rate	Dec. 31, 2012 Secured debt LIBOR Rate	Apr. 30, 2007 Secured debt Base rate	Dec. 31, 2012 Secured debt Base rate	Mar. 22, 2011 Revolving loan commitment	Apr. 30, 2007 Revolving loan commitment	Dec. 31, 2012 Revolving loan commitment LIBOR Rate	Dec. 31, 2012 Revolving loan commitment Base rate	Dec. 31, 2012 Letters of credit	Apr. 30, 2007 Letters of credit	Jan. 27, 2013 Subsequent events	Dec. 31, 2012 Subsequent events	Dec. 31, 2012 Subsequent events Secured debt	Jan. 27, 2013 Subsequent events Secured debt Minimum	Dec. 31, 2012 Subsequent events New term loan	Dec. 31, 2012 Subsequent events Revolving loan commitment	Dec. 31, 2012 Subsequent events Revolving loan commitment LIBOR Rate	Dec. 31, 2012 Subsequent events Revolving loan commitment Base rate	Dec. 31, 2012 Subsequent events Revolving loan commitment Maximum	Dec. 31, 2012 Subsequent events Letters of credit
Subsequent events
Capital to be provided to support recapitalization of the entity under plan of reorganization	$ 60,000,000															$ 60,000,000
Percentage of debt holders who voted and accepted the reorganization plan																			66.70%
Percentage of the shares of new common stock purchased in the reorganized entity																100.00%
Purchase price of the shares of new common stock purchased in the reorganized entity																60,000,000
Maturity period of new term loan resulting from restructuring of existing secured credit facility		5 years																5 years		5 years	4 years 6 months
Secured credit facility for which multi-year restructure received	346,400,000	346,400,000																346,400,000
Maximum borrowing capacity				675,000,000	625,000,000					25,000,000	50,000,000			7,500,000	15,000,000						20,000,000				5,000,000
Series B Cumulative Perpetual Convertible Preferred Stock, dividend rate (as a percent)		10.00%	10.00%														10.00%
Face amount of debt																				346,400,000
Period after petition date but before closing date considered for interest accrual																				90 days
Interest rate (as a percent)																				6.75%
Percentage of principal payment on outstanding balance at closing date																				1.00%
Percentage of eligible accounts receivable used to calculate maximum borrowing capacity																								85.00%
Fixed amount added to eligible accounts receivable to calculate the maximum borrowing capacity																								$ 5,000,000
Percentage of appraised fair market value of eligible owned real estate added to eligible accounts receivable to calculate maximum borrowing capacity																					75.00%
Variable rate basis		LIBOR				LIBOR	LIBOR	bank's base rate	bank's base rate			LIBOR	bank's base rate									1-, 2- or 3-month LIBOR	Base Rate
Margin (as a percent)						2.00%	5.00%	1.00%	4.00%			5.00%	4.00%									2.25%	1.25%