Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment Disposition of Assets (Details)

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Property, Plant and Equipment Disposition of Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Proceeds from the sale of assets $ 2,441 $ 830 $ 5,938