Information on Business Segments Details 1 (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 2,346,531	$ 2,137,539
Aerospace [Member]
Segment Reporting Information [Line Items]
Assets	648,561	647,766
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	1,502,193	1,356,081
Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 195,777	$ 133,692