Indebtedness Senior Secured Notes (Details) (USD $) In Thousands, unless otherwise specified						0 Months Ended
	Jun. 27, 2014	Dec. 31, 2013	Jun. 27, 2014 Senior notes Senior Secured Notes (9.50%)	Dec. 31, 2013 Senior notes Senior Secured Notes (9.50%)	Mar. 18, 2011 Senior notes Senior Secured Notes (9.50%)	Mar. 18, 2011 Senior notes Senior Secured Notes (9.50%) Change of control	Mar. 18, 2011 Senior notes Senior Secured Notes (9.50%) 2013	Mar. 18, 2011 Senior notes Senior Secured Notes (9.50%) 2014	Mar. 18, 2011 Senior notes Senior Secured Notes (9.50%) 2015 and thereafter	Mar. 18, 2011 Line of credit Senior Secured Notes (9.50%)
Debt Instrument [Line Items]
Long-term debt	$ 556,283	$ 535,396	$ 375,000	$ 375,000
Subsidiary ownership percentage	100.00%
Debt instrument, interest rate, stated percentage					9.50%
Foreign restricted subsidiaries, percent of voting capital stock, collateral										65.00%
Foreign restricted subsidiaries, percent of non-voting capital stock, collateral										100.00%
Prepayment redemption price percentages						101.00%	107.125%	104.75%	100.00%