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Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 20, 2020
Oct. 17, 2018
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jul. 31, 2018
Debt Instrument [Line Items]                  
Debt Instrument, interest rate 0.50%                
Outstanding letters of credit     $ 6,300,000     $ 6,300,000      
Debt instrument, periodic payment, interest rate     0.375%     0.375%      
Debt instrument fronting fees           $ 6,300,000      
Participation and fronting fees percentage on outstanding letter of credit           1.38%      
Interest expense including amortization of deferred financing costs and discounts     $ 9,500,000   $ 15,700,000 $ 22,000,000.0 $ 31,700,000    
Weighted average effective interest rates     3.60%     3.60%   5.50%  
First Lien Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate during the period           1.00%      
Debt instrument, maturity date           Feb. 28, 2025      
Debt instrument interest rate     3.60%     3.60%      
Debt instrument fee amount     $ 800,000     $ 800,000      
Debt instrument legal fees           $ 200,000      
First Lien Term Loan | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           3.25%      
First Lien Term Loan | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           2.25%      
Revolver                  
Debt Instrument [Line Items]                  
Mandatory prepayment of excess cash flow under loan agreement       $ 19,700,000          
Outstanding borrowings     0     $ 0      
Debt instrument borrow under new revolver     68,700,000     68,700,000      
Outstanding letters of credit     $ 6,300,000     $ 6,300,000      
Revolver | LIBOR 1.25%                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           1.25%      
Revolver | LIBOR 1.50%                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           1.50%      
Revolver | LIBOR 1.75%                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           1.75%      
Revolver | Base Rate 0.25%                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           0.25%      
Revolver | Base Rate 0.50%                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           0.50%      
Revolver | Base Rate 0.75%                  
Debt Instrument [Line Items]                  
Debt instrument interest rate per annum           0.75%      
2018 Credit Facilities                  
Debt Instrument [Line Items]                  
Outstanding borrowings                 $ 1,115,000,000
Debt instrument, aggregate principal amount                 1,040,000,000.00
Aggregate revolving commitment           $ 75,000,000      
2018 Credit Facilities | Second Lien Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 200,000,000              
Additional repayments of lines of credit   $ 70,000,000              
2018 Credit Facilities | Minimum | First Lien Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, face amount                 840,000,000
2018 Credit Facilities | Maximum | First Lien Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, face amount                 $ 910,000,000