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LONG-TERM DEBT (Schedule of Long Term Debt) (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Jul. 02, 2016
Debt Instrument [Line Items]      
Long-term debt $ 661,846 $ 580,376 $ 580,678
Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 400,000 400,000 400,000
Less unamortized issuance-related costs for senior notes (4,154) (4,601) (5,036)
Senior notes, net 395,846 395,399 394,964
Secured revolving credit facility [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 266,000 $ 184,977 $ 185,714