Goodwill and Other Intangible Assets (Changes in Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2010	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Ending Gross Amount	$ 290,386		$ 286,420
Finite-lived intangible assets, Accumulated Amortization	(198,603)		(185,536)
Indefinite-lived intangible assets, Ending Gross Amount	90,607		91,251
Indefinite-lived intangible assets, Accumulated Amortization	$ (1,585)		(1,585)
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	4 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	40 years
Engineering drawings
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Ending Gross Amount	$ 89,490		89,796
Finite-lived intangible assets, Accumulated Amortization	$ (78,854)		(75,239)
Engineering drawings | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	10 years
Engineering drawings | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	22 years
Existing customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)		5 years
Finite-lived intangible assets, Ending Gross Amount	$ 81,844		82,235
Finite-lived intangible assets, Accumulated Amortization	$ (53,468)		(47,016)
Existing customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years
Existing customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	10 years
Patents
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Ending Gross Amount	$ 26,132		26,251
Finite-lived intangible assets, Accumulated Amortization	$ (26,132)		(26,136)
Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	9 years
Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	16 years
Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Ending Gross Amount	$ 92,920		88,138
Finite-lived intangible assets, Accumulated Amortization	$ (40,149)		$ (37,145)
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	4 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	40 years