Other Liabilities (Details) - USD ($) $ in Thousands	Apr. 02, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Deferred compensation	$ 5,308	$ 5,247
Long-term income taxes payable	2,525	2,523
Asset retirement obligation	2,580	2,540
Post-retirement medical obligation	2,148	2,231
Long-term capital lease	290	575
Deferred service income-long term	0	49
Other	259	309
Balance, end of the period	$ 13,110	$ 13,474	[1]

[1] The balance sheet as of December 31, 2015 has been derived from the audited financial statements at that date.