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Acquisition (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
Aug. 31, 2016
Aug. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill     $ 950,681 $ 946,553
Axiall Corporation [Member]        
Business Acquisition [Line Items]        
Equity interest in acquiree held prior to combination, shares   3.1    
Offer per share $ 33.00      
Purchase consideration $ 2,539,360      
Goodwill $ 887,491