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SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Accounting Policies [Abstract]
Raw materials	$ 15,208				$ 13,119
Work-in-process	11,528				9,985
Finished goods	12,782				17,273
Supplies	583us-gaap_InventorySuppliesNetOfReserves				814us-gaap_InventorySuppliesNetOfReserves
Inventory, net	$ 40,101us-gaap_InventoryNet	$ 42,126us-gaap_InventoryNet	$ 45,887us-gaap_InventoryNet	$ 43,052us-gaap_InventoryNet	$ 41,191us-gaap_InventoryNet	$ 41,384us-gaap_InventoryNet	$ 45,190us-gaap_InventoryNet	$ 46,491us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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