Information on Business Segments Details 1 (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 2,195,653	$ 2,137,539
Aerospace [Member]
Segment Reporting Information [Line Items]
Assets	643,510	647,766
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	1,400,794	1,356,081
Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 151,349	$ 133,692