Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment - Narratives (Details)

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Property, Plant and Equipment - Narratives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Depreciation $ 124,551 $ 89,453 $ 28,790