XML 60 R50.htm IDEA: XBRL DOCUMENT v3.10.0.1
Acquisitions Acquistions (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Aug. 28, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Combinations [Abstract]        
Current assets $ 166      
Property, plant & equipment 17,543      
Goodwill 16,777 $ 304,733 $ 287,956 $ 275,487
Intangible and other non-current assets 3,863      
Assumed liabilities 399      
Purchase price $ 37,950