Property, Plant and Equipment Property, Plant and Equipment - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 6,221	$ 5,749	$ 18,279	$ 16,719
Cost	2,364		2,364		$ 2,242
Less : Accumulated amortization expense	791		791		336
Capitalized Computer Software, Net	$ 1,573		$ 1,573		$ 1,906