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VARIABLE INTEREST ENTITIES (Details) - USD ($)
$ in Thousands
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 307,318 331,432        
Property, Plant and Equipment, Net 482,593 527,414        
Other Assets, Noncurrent 111,781 116,757        
Assets 1,442,475 1,495,724        
Liabilities, Current 317,085 301,556        
Liabilities 899,090 905,666        
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