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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Accounting Policies [Abstract]    
United States $ 53,500 $ 41,749
Foreign 3,926 7,631
Earnings before income taxes $ 57,426 $ 49,380