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Property, Plant and Equipment Fairfielf Disposal (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fairfield Disposal [Abstract]    
Proceeds from Sale of Property, Plant, and Equipment $ 0 $ 6,177
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ 0 $ 5,422