Other Long Term Liabilities (Details) - USD ($) $ in Thousands	Apr. 03, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Finance lease obligations	$ 6,334	$ 14,845
Accrued pension liabilities	1,014	1,473
Accrued contingent considerations	12,001	16,504
Other	4,592	4,065
Total	$ 23,941	$ 36,887