Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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VARIABLE INTEREST ENTITIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 190,551	$ 201,451	$ 200,094	$ 189,360	$ 200,094	$ 189,360
Inventory, Net	307,318us-gaap_InventoryNet	331,432us-gaap_InventoryNet
Property, Plant and Equipment, Net	482,593us-gaap_PropertyPlantAndEquipmentNet	527,414us-gaap_PropertyPlantAndEquipmentNet
Other Assets, Noncurrent	111,781us-gaap_OtherAssetsNoncurrent	116,757us-gaap_OtherAssetsNoncurrent
Assets	1,442,475us-gaap_Assets	1,495,724us-gaap_Assets
Liabilities, Current	317,085us-gaap_LiabilitiesCurrent	301,556us-gaap_LiabilitiesCurrent
Liabilities	899,090us-gaap_Liabilities	905,666us-gaap_Liabilities
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and Cash Equivalents, at Carrying Value	1,100	8,861
Inventory, Net	9,064	9,645
Other Assets, Current	25,376	18,115
Property, Plant and Equipment, Net	33,660	36,353
Other Assets, Noncurrent	7,513	8,016
Assets	76,713	80,990
Liabilities, Current	13,365	11,659
Liabilities, Noncurrent	2,518	7,448
Liabilities	$ 15,883	$ 19,107