Information on Business Segments Details 1 (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 2,799,675	$ 2,808,970
Aerospace [Member]
Segment Reporting Information [Line Items]
Assets	706,633	692,584
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	1,934,014	1,962,362
Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 159,028	$ 154,024