Debt - Issuance of 10% Senior Secured Notes due 2017 (Details) (USD $)							6 Months Ended
	Jun. 30, 2013	Dec. 30, 2012	Jun. 30, 2013 Senior notes Senior Notes due June 2017	Jul. 27, 2011 Senior notes Senior Notes due June 2017	Mar. 25, 2011 Senior notes Senior Notes due June 2017	May 19, 2010 Senior notes Senior Notes due June 2017	Jun. 30, 2013 Senior notes Senior Notes due June 2017 Between 6/1/2014 and 6/1/2015	Jun. 30, 2013 Senior notes Senior Notes due June 2017 Between 6/1/2015 and 6/1/2016	Jun. 30, 2013 Senior notes Senior Notes due June 2017 After 6/1/2016	Jun. 30, 2013 Senior notes Senior Notes due June 2017 Prior to 6/1/2013
Debt Instrument [Line Items]
Stated interest rate percentage			10.00%
Principal amount outstanding	$ 630,300,000.0	$ 630,700,000.0	$ 625,000,000	$ 115,000,000	$ 285,000,000	$ 225,000,000
Long-term debt premium	$ 16,600,000	$ 18,700,000		$ 5,800,000	$ 20,000,000
Effective interest rate				8.90%	8.50%
Fixed charge coverage ratio			2.0
Redemption price as percentage of aggregate principal amount							105.00%	102.50%	100.00%	110.00%
Permitted redemption amount as percentage of aggregate principal amount										35.00%