Summary of Other Long Term Liabilities (Details) - USD ($) $ in Thousands	Jul. 03, 2015	Dec. 31, 2014
Other Liabilities Noncurrent [Abstract]
Capital lease obligations	$ 9,269	$ 9,507
Accrued pension liabilities	5,305	6,037
Other	3,683	3,275
Total	$ 18,257	$ 18,819