Long-Term Debt (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended							0 Months Ended												0 Months Ended				0 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended										0 Months Ended	12 Months Ended
	Mar. 24, 2010	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Jan. 31, 2012	Nov. 01, 2010	Jan. 31, 2012 2012 Senior Notes	Jan. 31, 2012 Term Loan and ABL Revolver 2012	Nov. 01, 2010 Senior Notes 2010 Senior Notes	Mar. 24, 2010 Senior Notes 2010 Senior Notes	Mar. 31, 2011 Senior Notes 2010 Senior Notes	Mar. 24, 2010 Senior Notes 2010 Senior Notes Prior To April 1, 2014	Mar. 24, 2010 Senior Notes 2010 Senior Notes Twelve Months Beginning April 1, 2014	Mar. 24, 2010 Senior Notes 2010 Senior Notes Twelve Months Beginning April 1, 2015	Mar. 24, 2010 Senior Notes 2010 Senior Notes On or After April 1, 2016	Mar. 24, 2010 Senior Notes 2010 Senior Notes Prior to April 1, 2013	Jan. 31, 2012 Senior Notes 2012 Senior Notes	Jan. 31, 2012 Senior Notes 2012 Senior Notes Prior To April 1, 2014	Jan. 31, 2012 Senior Notes 2012 Senior Notes Prior to April 1, 2013	Jan. 31, 2012 Senior Notes 2012 Senior Notes Upon Change in Control	Jan. 31, 2012 Term Loans 2010 Term Loan	Nov. 01, 2010 Term Loans 2010 Term Loan	Mar. 24, 2010 Term Loans 2010 Term Loan	Mar. 24, 2010 Term Loans 2010 Term Loan LIBOR	Jan. 31, 2012 Term Loans 2012 Term Loan	Mar. 31, 2012 Term Loans 2012 Term Loan	Dec. 31, 2011 Term Loans 2012 Term Loan	Mar. 31, 2013 Term Loans 2012 Term Loan	Mar. 31, 2013 Term Loans Amended 2012 Term Loan	Feb. 21, 2013 Term Loans Amended 2012 Term Loan	Feb. 21, 2013 Term Loans Amended 2012 Term Loan LIBOR	Feb. 21, 2013 Term Loans Amended 2012 Term Loan LIBOR Minimum	Feb. 21, 2013 Term Loans Amended 2012 Term Loan Base Rate	Jan. 31, 2012 Term Loans Amended 2012 Term Loan Base Rate Federal Funds Rate	Jan. 31, 2012 Term Loans Amended 2012 Term Loan Base Rate LIBOR	Apr. 15, 2010 Senior Subordinated Notes Senior Subordinated Notes Due in 2012	Nov. 01, 2010 Revolving Credit Facility 2010 Revolving Credit Facility	Mar. 24, 2010 Revolving Credit Facility 2010 Revolving Credit Facility	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver	Mar. 31, 2013 Revolving Credit Facility 2012 ABL Revolver	Dec. 31, 2012 Revolving Credit Facility 2012 ABL Revolver	Sep. 30, 2012 Revolving Credit Facility 2012 ABL Revolver	Sep. 29, 2012 Revolving Credit Facility 2012 ABL Revolver	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver LIBOR	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver LIBOR Minimum	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver LIBOR Maximum	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver Base Rate	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver Base Rate Minimum	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver Base Rate Maximum	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver Base Rate Federal Funds Rate	Jan. 31, 2012 Revolving Credit Facility 2012 ABL Revolver Base Rate LIBOR
Debt Instrument [Line Items]
Debt instrument, face amount																		$ 150,000,000.0							$ 250,000,000.0						$ 150,000,000.0		$ 660,000,000.0
Debt instrument, stated interest rate																		8.25%							8.125%																			9.25%
Debt instrument, increase, additional borrowings																	100,000,000.0													115,000,000.0
Debt instrument, unamortized discount		7,100,000				11,092,000				7,100,000	11,092,000							2,200,000													1,800,000
Debt instrument, unamortized premium																		300,000
Proceeds from issuance of long-term debt																	100,300,000	147,800,000													148,200,000		650,100,000
Debt instrument, effective interest rate																			8.50%												5.00%
Percentage of subsidiary owned		100.00%								100.00%			100.00%
Debt instrument, basis spread on variable rate																																3.25%							2.75%	1.00%
Debt instrument, reference rate floor																															1.50%							1.00%
Loss on extinguishment of debt		1,443,000	0	0	0	5,409,000	0	0	0	1,443,000	5,409,000	300,000																	5,400,000								(1,400,000)
Line of credit facility, maximum borrowing capacity																																													40,000,000.0	30,000,000.0	50,000,000			75,000,000
Line of credit facility, increase in borrowing capacity																																													10,000,000.0						25,000,000.0
Debt instrument, discount, percentage																																	1.50%
Debt issuance costs capitalized	6,600,000													600,000	12,600,000	20,600,000									12,600,000								18,800,000														1,800,000
Debt issuance costs	7,300,000
Debt issuance costs charged to expense	700,000
Debt instrument, basis spread on variable rate, fixed component																																									2.00%	0.50%	1.00%															0.50%	1.00%
Repayments of long-term debt										190,000,000	25,000,000	51,087,000																						25,000,000		190,000,000
Debt instrument, variable rate																																																				1.75%			0.75%
Debt instrument, conditional variable rate																																																					2.00%	2.25%		1.00%	1.25%
Line of credit facility, commitment fee percentage																																															0.50%
Line of credit facility, conditional commitment fee percentage																																															0.375%
Line of credit facility, interest rate at period end																																					5.20%												2.20%
Quarterly payment, percent of original principal amount																																	0.25%
Accelerated amortization of deferred financing costs																																			5,100,000
Debt instrument, maturity term																																	7 years														5 years
Debt instrument, redemption price, percentage of principal amount																				100.00%	104.125%	102.063%	100.00%	108.25%		100.00%	108.125%	101.00%
Debt instrument, percentage of principal amount eligible for redemption																								35.00%			35.00%
Line of credit facility, net amount borrowed in period																																																33,000,000
Accelerated amortization of debt discount																																			$ 2,600,000