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Long-term debt schedule (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 28, 2014
Apr. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Long-term Debt $ 817,700 $ 820,000  
Long-term Debt, Current Maturities 4,600   0
Long-term Debt, Excluding Current Maturities 813,100   0
Senior secured term loan [Member]
     
Debt Instrument [Line Items]      
Long-term Debt 457,700    
Senior unsecured notes [Member]
     
Debt Instrument [Line Items]      
Long-term Debt $ 360,000