Inventories (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 03, 2016
Inventory [Line Items]
Inventory, Raw Materials, Gross		$ 54,359	$ 51,439
Provision Bankruptcy Settlement		9,297	15,404	$ 12,993
Provision for Inventory Obsolescence Allowance		4,100	5,200	5,000
Total restructuring charges, net		8,975	4,634	5,246
Inventories		149,584	177,840
Structural Landing Gear [Member]
Inventory [Line Items]
Inventories					$ 200
Inventory Related Charges [Member]
Inventory [Line Items]
Total restructuring charges, net		2,800	9,400	8,000
Energy [Member]
Inventory [Line Items]
Total restructuring charges, net		$ 3,185	$ 2,903	$ 1,963
Energy [Member] | Inventory Related Charges [Member]
Inventory [Line Items]
Total restructuring charges, net	$ 200