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LONG-TERM DEBT (Details)
3 Months Ended
Oct. 19, 2017
USD ($)
Apr. 02, 2014
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Debt outstanding       $ 0
Interest expense, debt     $ 700,000  
Amortization of debt issuance costs     200,000  
Commitment fee     500,000  
Capitalized debt issuance costs     3,000,000  
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Debt outstanding     $ 200,000 $ 0
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Term of loan   5 years    
Revolving Credit Facility [Member] | 2017 Credit Agreement [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 750,000,000      
Term of loan 5 years      
Covenant compliance, secured leverage ratio 3.50      
Covenant compliance, total leverage ratio 4.50      
Letter of Credit [Member] | 2017 Credit Agreement [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 20,000,000      
Interest rate, increase (decrease) 2.00%      
Letter of Credit [Member] | 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Basis spread on federal funds rate (in percent) 1.00%      
Letter of Credit [Member] | 2017 Credit Agreement [Member] | Federal Funds Rate [Member]        
Debt Instrument [Line Items]        
Basis spread on federal funds rate (in percent) 0.50%      
Initial Basis Spread [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Basis spread on federal funds rate (in percent) 1.25%      
Initial Basis Spread One Month LIBOR [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Basis spread on federal funds rate (in percent) 0.25%