Other Long Term Liabilities (Details) - USD ($) $ in Thousands	Sep. 27, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Finance lease obligations	$ 14,960	$ 7,275
Accrued pension liabilities	2,473	3,758
Accrued contingent considerations	14,998	3,376
Other	4,384	2,778
Total	$ 36,815	$ 17,187