Information on Business Segments Details 1 (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 2,286,375	$ 2,137,539
Aerospace [Member]
Segment Reporting Information [Line Items]
Assets	647,192	647,766
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	1,473,149	1,356,081
Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 166,034	$ 133,692