Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 25, 2016
Property, Plant and Equipment [Line Items]
Land and buildings		$ 73,803		$ 67,915
Machinery and equipment		486,612		485,185
Leasehold improvements and others		4,204		4,868
Construction in progress		20,455		26,301
Property, plant and equipment, gross		585,074		584,269
Accumulated depreciation		(350,428)		(356,866)
Property, plant and equipment, net	$ 227,403	234,646		$ 227,403
Depreciation expense	$ 34,300	$ 34,500	$ 35,600
Other Depreciation and Amortization			6,500
Air Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			$ 200