Segment Reporting (Reportable Segments Consolidated Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total Assets	$ 7,388,196	$ 6,772,002
Operating Segments [Member]
Total Assets	6,592,307	6,457,875
Operating Segments [Member] | Industrial [Member]
Total Assets	6,312,777	4,828,984
Operating Segments [Member] | Non-reportable segments
Total Assets	136,927	1,501,737
Operating Segments [Member] | Service Operations [Member]
Total Assets	142,603	127,154
Corporate, Non-Segment [Member]
Total Assets	$ 795,889	$ 314,127