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LONG-TERM OBLIGATIONS - 2017 Credit Agreement (Details)
3 Months Ended 9 Months Ended
Aug. 17, 2017
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jan. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Loss on early extinguishment of debt   $ (700,000) $ 0 $ (52,600,000) $ (400,000)  
2017 Credit Agreement            
Debt Instrument [Line Items]            
Loss on early extinguishment of debt   (700,000)        
Percentage of capital stock of foreign subsidiary pledged as collateral for borrowings (as a percent)           65.00%
Line of Credit | 2017 Credit Agreement            
Debt Instrument [Line Items]            
Incremental borrowing capacity           $ 300,000,000
Line of Credit | Revolving Credit Facility | 2017 Credit Agreement            
Debt Instrument [Line Items]            
Available borrowing capacity           $ 450,000,000
Line of credit   0   $ 0    
Springing covenant threshold           30.00%
Debt instrument covenant minimum interest coverage ratio       2.5    
Debt instrument covenant senior secured debt leverage ratio maximum       2.75    
Line of Credit | Secured Debt | 2017 Credit Agreement            
Debt Instrument [Line Items]            
Line of credit           $ 400,000,000
Decrease in interest rate (0.25%)          
Long-term debt   $ 396,000,000   $ 396,000,000    
Debt, weighted average interest rate   3.58%   3.58%    
Line of Credit | Letter of Credit | 2017 Credit Agreement            
Debt Instrument [Line Items]            
Letters of credit outstanding, amount   $ 57,000,000   $ 57,000,000    
Line of Credit | Letter of Credit | Additional Credit Agreement 2017            
Debt Instrument [Line Items]            
Letters of credit maximum available under additional facilities           $ 300,000,000
Letters of credit outstanding, amount   34,200,000   34,200,000    
Line of Credit | Letter of Credit | Bilateral Arrangements 2017 Credit Agreement            
Debt Instrument [Line Items]            
Letters of credit outstanding, amount   $ 22,800,000   $ 22,800,000