Information on Business Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Revenues	$ 1,491,118	$ 1,495,889	$ 1,436,499
Operating profit	236,448	231,764	206,451
Assets	2,738,335	2,808,970	2,365,700
Depreciation and amortization	99,059	94,238	90,150
Capital expenditures	53,286	57,273	58,712
Interest expense	20,629	16,841	14,571
Other expense (income), net	8,975	7,428	(3,819)
Income before income taxes	$ 206,844	$ 207,495	$ 195,699
General Electric [Member]
Segment Reporting Information [Line Items]
Revenue by major customer	21.00%	18.00%	18.00%
Industrial [Member]
Segment Reporting Information [Line Items]
Revenues	$ 938,507	$ 994,727	$ 973,900
Operating profit	114,000	130,400	122,800
Assets	1,879,300	1,962,400	1,505,400
Depreciation and amortization	62,400	57,600	54,800
Capital expenditures	25,300	33,400	31,000
Aerospace [Member]
Segment Reporting Information [Line Items]
Revenues	552,611	501,162	462,600
Operating profit	122,500	101,400	83,600
Assets	704,300	692,600	667,100
Depreciation and amortization	35,900	35,900	33,600
Capital expenditures	26,000	23,600	27,500
Other [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0
Operating profit	0	0	0
Assets	154,800	154,000	193,300
Depreciation and amortization	800	800	1,700
Capital expenditures	$ 2,000	$ 300	$ 200