Summary of Other Long Term Liabilities (Details) - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
Other Liabilities Noncurrent [Abstract]
Capital lease obligations	$ 8,598	$ 9,173
Accrued pension liabilities	2,769	3,693
Accrued contingent considerations	1,645	3,889
Other	2,500	2,690
Total	$ 15,512	$ 19,445