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LONG-TERM OBLIGATIONS - 2017 Credit Agreement (Details)
3 Months Ended
Feb. 28, 2018
Aug. 17, 2017
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Apr. 10, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Loss on early extinguishment of debt     $ (700,000) $ (45,400,000)      
2017 Credit Agreement              
Debt Instrument [Line Items]              
Loss on early extinguishment of debt     (700,000)        
Letters of credit outstanding, amount           $ 0  
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 | Secured Debt | 2017 Credit Agreement              
Debt Instrument [Line Items]              
Decrease in interest rate (0.25%) (0.25%)          
Line of credit             $ 400,000,000
Long-term debt     $ 394,200,000     $ 395,100,000  
Debt, weighted average interest rate     3.99%     3.94%  
Line of Credit | Revolving Credit Facility | 2017 Credit Agreement              
Debt Instrument [Line Items]              
Available borrowing capacity     $ 450,000,000        
Line of credit     $ 98,500,000.0     $ 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        
Debt, weighted average interest rate     5.08%        
Line of Credit | Revolving Credit Facility | 2017 Credit Agreement | Subsequent Event              
Debt Instrument [Line Items]              
Available borrowing capacity         $ 600,000,000    
Line of Credit | Letter of Credit | 2017 Credit Agreement              
Debt Instrument [Line Items]              
Letters of credit outstanding, amount     $ 58,600,000     57,400,000  
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     34,700,000     34,300,000  
Line of Credit | Letter of Credit | Bilateral Arrangements 2017 Credit Agreement              
Debt Instrument [Line Items]              
Letters of credit outstanding, amount     $ 23,900,000     $ 23,100,000  
Line of Credit | LIBOR | Secured Debt | 2017 Credit Agreement              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.00%            
Floor interest rate 0.75%