Information on Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 1,193,975	$ 1,262,006	$ 1,091,566
Operating profit	168,396	179,974	123,201
Assets	2,061,866	2,073,885	2,123,673
Depreciation and amortization	78,242	81,395	65,052
Capital expenditures	45,982	57,365	57,304
Interest expense	10,698	11,392	13,090
Other (income) expense, net	(248)	2,082	2,537
Income from continuing operations before income taxes	$ 157,946	$ 166,500	$ 107,574
General Electric [Member]
Segment Reporting Information [Line Items]
Revenue by major customer	18.00%	19.00%	21.00%
Aerospace [Member]
Segment Reporting Information [Line Items]
Revenues	$ 411,700	$ 440,000	$ 404,000
Operating profit	65,400	71,600	51,300
Assets	654,100	655,000	567,100
Depreciation and amortization	30,800	24,900	23,200
Capital expenditures	17,200	20,900	23,800
Industrial [Member]
Segment Reporting Information [Line Items]
Revenues	782,300	822,100	687,600
Operating profit	103,000	108,400	71,900
Assets	1,241,200	1,282,000	1,410,400
Depreciation and amortization	46,000	54,700	38,400
Capital expenditures	28,700	36,100	31,300
Other [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0
Operating profit	0	0	0
Assets	166,500	136,900	146,200
Depreciation and amortization	1,300	1,800	3,500
Capital expenditures	$ 100	$ 400	$ 2,200