Liquidity (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Line of Credit Facility [Line Items]
Credit Facility, Minimum Cash Balance Required	$ 50,000,000
Credit Facility, Minimum Cash Balance Required, Increase	119,400,000
ABL Facility Credit Agreement [Member]
Debt Instrument, Covenants [Abstract]
Minimum Consolidated EBITDA, March 31, 2013	200,000,000
Minimum Consolidated EBITDA, June 30, 2013	235,000,000
Minimum Consolidated EBITDA, September 30, 2013	260,000,000
Minimum Consolidated EBITDA, December 31, 2013	275,000,000
Minimum Consolidated EBITDA, March 31, 2014	300,000,000
Minimum Consolidated EBITDA, June 30, 2014	325,000,000
Minimum Consolidated EBITDA, September 30, 2014	355,000,000
Maximum Total Leverage Ratio, March 31, 2013	7.4
Maximum Total Leverage Ratio, June 30, 2013	6.5
Maximum Total Leverage Ratio, September 30, 2013	6.0
Maximum Total Leverage Ratio, December 31, 2013	5.7
Maximum Total Leverage Ratio, March 31, 2014	5.1
Maximum Total Leverage Ratio, June 30, 2014	4.8
Maximum Total Leverage Ratio, September 30, 2014	4.6
Maximum Total Leverage Ratio, December 31, 2014	4.4
Minimum Interest Coverage Ratio, March 31, 2013	1.20
Minimum Interest Coverage Ratio, June 30, 2013	1.45
Minimum Interest Coverage Ratio, September 30, 2013	1.60
Minimum Interest Coverage Ratio, December 31, 2013	1.65
Minimum Interest Coverage Ratio, March 31, 2014	1.80
Minimum Interest Coverage Ratio, June 30, 2014	1.90
Minimum Interest Coverage Ratio, September 30, 2014	2.10
Minimum Interest Coverage Ratio, December 31, 2014	2.15
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000
Line of Credit Facility, Remaining Borrowing Capacity	359,000,000
Debt Instrument, Covenant, Minimum Consolidated EBITDA, Quarter Nine	$ 365,000,000