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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 26, 2016
Mar. 28, 2015
Accounting Policies [Abstract]    
United States $ 39,600 $ 32,641
Foreign 10,844 15,804
Earnings before income taxes $ 50,444 $ 48,445