Goodwill And Other Intangible Assets (Goodwill By Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 115,452	$ 72,429
Goodwill, acquired during period	93,425	49,387
Goodwill, Transfers	0
Currency translation adjustments	(2,218)	(6,364)
Goodwill, Ending Balance	206,659	115,452	$ 72,429
Energy [Member]
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit			425
Goodwill, Beginning Balance	43,687	48,070
Goodwill, acquired during period	93,228	0
Goodwill, Transfers	8,285
Currency translation adjustments	(795)	(4,383)
Goodwill, Ending Balance	144,405	43,687	48,070
Aerospace [Member]
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit			301
Goodwill, Beginning Balance	71,765	24,359
Goodwill, acquired during period	197	49,387
Goodwill, Transfers	(8,285)
Currency translation adjustments	(1,423)	(1,981)
Goodwill, Ending Balance	$ 62,254	$ 71,765	$ 24,359