Segment Reporting (Reportable Segments Consolidated Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Total Assets	$ 7,804,024	$ 7,388,196
Operating Segments [Member]
Total Assets	7,331,484	6,592,307
Operating Segments [Member] | Industrial [Member]
Total Assets	7,155,505	6,312,777
Operating Segments [Member] | Non-reportable segments
Total Assets	43,496	136,927
Operating Segments [Member] | Service Operations [Member]
Total Assets	132,483	142,603
Corporate, Non-Segment [Member]
Total Assets	$ 472,540	$ 795,889