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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Raw materials $ 78,599us-gaap_InventoryRawMaterialsNetOfReserves $ 69,776us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 33,941us-gaap_InventoryWorkInProcessNetOfReserves 22,183us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 19,969us-gaap_InventoryFinishedGoodsNetOfReserves 17,661us-gaap_InventoryFinishedGoodsNetOfReserves
Operating and other supplies 150,971us-gaap_InventorySuppliesNetOfReserves 129,995us-gaap_InventorySuppliesNetOfReserves
Inventories (1) $ 283,480us-gaap_InventoryNet [1] $ 239,615us-gaap_InventoryNet [1]
[1] Includes inventory acquired in connection with the Mt. Holly acquisition. See Note 2 Business acquisitions for additional information about the Mt. Holly acquisition.