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INDEBTEDNESS - Additional Information (Details) - USD ($)
1 Months Ended 5 Months Ended 12 Months Ended
Jan. 31, 2021
Nov. 30, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 06, 2019
Debt Instrument [Line Items]              
Principal amount of debt     $ 1,286,496,000 $ 1,124,353,000 $ 1,286,496,000    
Paid-in-kind interest capitalized as principal       7,525,000 12,256,000 $ 0  
Payments to extinguish debt       9,250,000 2,075,000 5,150,000  
Loss on extinguishment of debt       11,545,000 5,469,000 72,000  
Proceeds from issuance of debt       0 981,050,000 1,000,000  
Debt issuance costs     30,689,000 23,823,000 30,689,000    
Fees incurred netted against proceeds       149,000 30,022,000 $ 0  
Common Stock | Public Offering              
Debt Instrument [Line Items]              
Proceeds from sale of equity       118,900,000      
Senior Notes              
Debt Instrument [Line Items]              
Loss on extinguishment of debt         5,500,000    
Credit Arrangements Administered By Bank Of America, N.A. | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments       645,000,000.0      
Loss on extinguishment of debt         (2,300,000)    
Credit Agreements, Entered Into 2019              
Debt Instrument [Line Items]              
Loss on extinguishment of debt       11,500,000      
Prepayment penalty       3,500,000      
Deferred commitment fee       8,000,000.0      
Credit Agreements, Entered Into 2019 | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments             $ 1,475,000,000.0
Proceeds from issuance of debt         981,100,000    
Debt issuance costs and third party fees     52,600,000   52,600,000    
Debt issuance costs     48,100,000   48,100,000    
Issuance costs expensed     1,300,000   1,300,000    
Fees incurred netted against proceeds         21,300,000    
Deferred financing costs         30,000,000.0    
Deferred financing costs, investing activities         1,300,000    
Credit Agreements, Entered Into 2019 | Notes Payable              
Debt Instrument [Line Items]              
Payments to extinguish debt       174,000,000.0      
Credit Arrangements, Entered Into 2015, Modified Loans | Senior Notes              
Debt Instrument [Line Items]              
Debt issuance costs     7,600,000   7,600,000    
Revolving Credit Facility | Senior Notes              
Debt Instrument [Line Items]              
Principal amount of debt     0 0 0    
Debt issuance costs     0 0 0    
Revolving Credit Facility | Credit Agreements, Entered Into 2019 | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments       $ 175,000,000.0     150,000,000.0
Base rate       0.25%      
Commitment fee percentage       2.50%      
Principal amount of debt     $ 0 $ 0 $ 0    
Net borrowing availability       $ 165,400,000      
Revolving Credit Facility | Minimum | Credit Agreements, Entered Into 2019 | Senior Notes              
Debt Instrument [Line Items]              
Commitment fee, unused portion       0.25%      
Revolving Credit Facility | Minimum | Credit Agreements, Entered Into 2019 | Senior Notes | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.25%      
Revolving Credit Facility | Minimum | Credit Agreements, Entered Into 2019 | Senior Notes | Eurocurrency Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       2.25%      
Revolving Credit Facility | Maximum | Credit Agreements, Entered Into 2019 | Senior Notes              
Debt Instrument [Line Items]              
Commitment fee, unused portion       0.375%      
Revolving Credit Facility | Maximum | Credit Agreements, Entered Into 2019 | Senior Notes | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.75%      
Revolving Credit Facility | Maximum | Credit Agreements, Entered Into 2019 | Senior Notes | Eurocurrency Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       2.75%      
Letters of Credit | Credit Agreements, Entered Into 2019 | Senior Notes              
Debt Instrument [Line Items]              
Undrawn letters of credit issued and outstanding       $ 9,600,000      
First Lien Term Loan | Senior Notes              
Debt Instrument [Line Items]              
Principal amount of debt             575,000,000.0
First Lien Term Loan | Credit Arrangements Administered By Bank Of America, N.A. | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments       415,000,000.0      
Quarterly installment payments       1,000,000.0      
Weighted average interest rate     6.20%   6.20%    
First Lien Term Loan | Credit Agreements, Entered Into 2019 | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments             925,000,000.0
Quarterly installment payments       $ 2,300,000      
Weighted average interest rate paid on term loans during period     6.47% 5.09%      
Basis spread on variable rate       4.25%      
Effective rate on term loans at end of period     6.20% 4.40% 6.20%    
Payments to extinguish debt         $ 226,700,000    
Proceeds from issuance of debt         $ 752,400,000    
First Lien Term Loan | Credit Agreements, Entered Into 2019 | Senior Notes | Subsequent Event              
Debt Instrument [Line Items]              
Face amount of debt instruments $ 250,000,000.0            
Quarterly installment payments $ 2,900,000            
Basis spread on variable rate 3.75%            
First Lien Term Loan | Minimum | Credit Agreements, Entered Into 2019 | Senior Notes | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       3.25%      
First Lien Term Loan | Minimum | Credit Agreements, Entered Into 2019 | Senior Notes | Eurocurrency Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       4.25%      
First Lien Term Loan | Maximum | Credit Agreements, Entered Into 2019 | Senior Notes | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       3.50%      
First Lien Term Loan | Maximum | Credit Agreements, Entered Into 2019 | Senior Notes | Eurocurrency Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       4.50%      
Second Lien Term Loan | Credit Arrangements Administered By Bank Of America, N.A. | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments             150,000,000.0
Weighted average interest rate paid on term loans during period         11.36%    
Second Lien Term Loan | Credit Agreements, Entered Into 2019 | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments             $ 400,000,000.0
Weighted average interest rate paid on term loans during period     11.45% 9.39%      
Effective rate on term loans at end of period     10.66% 8.98% 10.66%    
Interest capitalized to debt principal   $ 12,300,000          
Paid-in-kind interest capitalized as principal       $ 7,500,000      
Additional interest expense charge       1.00%      
Payments to extinguish debt         $ 0    
Loss on extinguishment of debt         3,200,000    
Proceeds from issuance of debt         $ 250,000,000.0    
Second Lien Term Loan | Credit Agreements, Entered Into 2019 | Senior Notes | Subsequent Event              
Debt Instrument [Line Items]              
Prepayment penalty $ 4,900,000            
Second Lien Term Loan | Credit Agreements, Entered Into 2019 | Senior Notes | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate       8.75%      
Second Lien Term Loan | Credit Agreements, Entered Into 2019 | Notes Payable | Subsequent Event              
Debt Instrument [Line Items]              
Payments to extinguish debt $ 245,800,000            
Bank Of America, N.A. | Revolving Credit Facility | Credit Arrangements Administered By Bank Of America, N.A. | Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt instruments       $ 80,000,000.0