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LONG-TERM OBLIGATIONS - 2017 Credit Agreement (Details)
3 Months Ended 6 Months Ended
Feb. 28, 2018
Aug. 17, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Debt Instrument [Line Items]                  
Loss on early extinguishment of debt     $ 0 $ (6,500,000) $ (700,000) $ (51,900,000)      
2017 Credit Agreement                  
Debt Instrument [Line Items]                  
Loss on early extinguishment of debt         (700,000)        
Letters of credit outstanding, amount     0   0        
Percentage of capital stock of foreign subsidiary pledged as collateral for borrowings (as a percent)                 65.00%
Letter of Credit | 2017 Credit Agreement                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     400,000,000   400,000,000        
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     $ 393,200,000   $ 393,200,000     $ 395,100,000  
Debt, weighted average interest rate     4.33%   4.33%     3.94%  
Line of Credit | Revolving Credit Facility | 2017 Credit Agreement                  
Debt Instrument [Line Items]                  
Available borrowing capacity     $ 600,000,000   $ 600,000,000   $ 450,000,000    
Line of credit     $ 110,500,000   $ 110,500,000     $ 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     4.73%   4.73%        
Line of Credit | Letter of Credit | 2017 Credit Agreement                  
Debt Instrument [Line Items]                  
Letters of credit outstanding, amount     $ 67,300,000   $ 67,300,000     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     33,700,000   33,700,000     34,300,000  
Line of Credit | Letter of Credit | Bilateral Arrangements 2017 Credit Agreement                  
Debt Instrument [Line Items]                  
Letters of credit outstanding, amount     $ 33,600,000   $ 33,600,000     $ 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%