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LONG-TERM DEBT (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 19, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 25, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Interest expense, debt   $ 4,486,000 $ 697,000 $ 5,658,000 $ 1,429,000    
Amortization of debt issuance costs   216,000 219,000 508,000 438,000    
Commitment fee   37,000 478,000 641,000 991,000    
Capitalized debt issuance costs   2,000,000   2,000,000     $ 2,000,000
Borrowings [Member]              
Debt Instrument [Line Items]              
Interest expense, debt   4,233,000 $ 0 4,509,000 $ 0    
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of credit facility, amount outstanding   $ 745,000,000   $ 745,000,000   $ 745,000,000 0
Debt, Weighted Average Interest Rate   2.20%   2.20%      
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]              
Debt Instrument [Line Items]              
Remaining borrowing capacity   $ 20,000,000   $ 20,000,000      
Long-term debt   200,000   200,000      
Line of credit facility, amount outstanding             $ 200,000
Letter of Credit [Member] | 2017 Credit Agreement [Member]              
Debt Instrument [Line Items]              
Remaining borrowing capacity   $ 4,800,000   $ 4,800,000      
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 1.00%            
Letter of Credit [Member] | 2017 Credit Agreement [Member] | Federal Funds Rate [Member]              
Debt Instrument [Line Items]              
Basis spread 0.50%            
Letter of Credit [Member] | 2017 Credit Agreement [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Basis spread 2.00%            
Initial Basis Spread [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Basis spread 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 0.25%