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FAIR VALUE MEASUREMENTS - Carrying Amount and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Less: Current maturities of long-term debt $ (82,000) $ 0
Long-term debt (973,129) (972,567)
Marketable equity securities 10,582 0
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 68,735 148,374
Restricted cash 1,233 8,080
Less: Current maturities of long-term debt (82,000) 0
Long-term debt (973,129) (972,567)
Marketable equity securities 10,582 0
Carrying Amount | Interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset   23,735
Derivative liability (8,454)  
Carrying Amount | Foreign currency exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset 642  
Derivative liability   (1,442)
Carrying Amount | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset 303 145
Carrying Amount | Carbon options    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liability (607) (322)
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 68,735 148,374
Restricted cash 1,233 8,080
Less: Current maturities of long-term debt 0 0
Long-term debt 0 0
Marketable equity securities 10,582 0
Fair Value | Level 1 | Interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset   0
Derivative liability 0  
Fair Value | Level 1 | Foreign currency exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset 0  
Derivative liability   0
Fair Value | Level 1 | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset 0 0
Fair Value | Level 1 | Carbon options    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liability 0 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Less: Current maturities of long-term debt (82,000) 0
Long-term debt (981,500) (975,845)
Marketable equity securities 0 0
Fair Value | Level 2 | Interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset   23,735
Derivative liability (8,454)  
Fair Value | Level 2 | Foreign currency exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset 642  
Derivative liability   (1,442)
Fair Value | Level 2 | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative asset 303 145
Fair Value | Level 2 | Carbon options    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liability $ (607) $ (322)