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Derivative Financial Instruments and Fair Value Measurements (Contingent Consideration) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Derivative [Line Items]        
Balance, beginning of period $ (4,286) $ (8,904) $ (4,286) $ (11,320)
Fair value adjustments 0 (43) 0 2,373
Payments 0 4,399 0 4,399
Balance, end of period $ (4,286) $ (4,548) $ (4,286) $ (4,548)