Inventory and Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory and Other Current Assets [Abstract]
Inventory	$ 164,002	$ 162,919
Finished Goods	66,340	65,621
Work in progress	18,445	20,064
Raw materials	33,281	20,764
Supplies and consumables	$ 45,936	$ 56,470