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VARIABLE INTEREST ENTITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 143,236 $ 147,827 $ 207,238 $ 200,188
Inventory, Net 323,491 272,236    
Property, Plant and Equipment, Net 435,731 437,201    
Other Assets, Noncurrent 101,156 99,514    
Total assets 1,311,951 1,265,896    
Total current liabilities 347,664 366,104    
Other long-term liabilities 77,826 80,161    
Total liabilities 852,527 868,208    
Accounts payable 187,077 148,255    
Variable Interest Entity, Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Cash and Cash Equivalents, at Carrying Value 12,123 9,396    
Inventory, Net 17,340 11,445    
Other Assets, Current 15,980 23,301    
Property, Plant and Equipment, Net 32,731 30,448    
Other Assets, Noncurrent 6,838 4,955    
Total assets 85,012 79,545    
Total current liabilities 20,909 22,068    
Other long-term liabilities 9,199 5,350    
Total liabilities 30,108 27,418    
Variable Interest Entity, Not Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Other Assets, Current 1,165 1,039    
Investments 3,626 4,738    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 4,791 5,777    
Accounts payable 1,804 932    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 6,595 $ 6,709