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Long-term debt schedule (Details) - USD ($)
$ in Thousands
Sep. 26, 2015
Dec. 31, 2014
Apr. 30, 2014
Apr. 01, 2014
Debt Instrument [Line Items]        
Long-term Debt $ 667,130 $ 766,796    
Senior secured term loan [Member]        
Debt Instrument [Line Items]        
Long-term Debt 307,130 406,796 $ 460,000  
Senior unsecured notes [Member]        
Debt Instrument [Line Items]        
Long-term Debt 360,000 360,000   $ 360,000
Senior secured Asset Based [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 0 $ 0