Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory, Net [Abstract]
Finished goods	$ 211,426	$ 343,959
Work in process	34,091	40,951
Raw materials, supplies and other	42,556	37,993
Inventory, net	$ 288,073	$ 422,903