Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventories    
Finished goods and work-in-process $ 59,776us-gaap_InventoryFinishedGoodsAndWorkInProcessNetOfReserves $ 38,906us-gaap_InventoryFinishedGoodsAndWorkInProcessNetOfReserves
Raw material and supplies 11,177us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves 9,342us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Inventories $ 70,953us-gaap_InventoryNet $ 48,248us-gaap_InventoryNet