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Debt - Senior Secured Credit Facilities Narrative (Details)
12 Months Ended
Dec. 17, 2020
USD ($)
Aug. 27, 2020
Aug. 26, 2020
Jul. 18, 2016
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 16, 2020
USD ($)
Debt Instrument [Line Items]                
Proceeds of borrowings from lenders         $ 2,982,000,000 $ 45,000,000 $ 0  
Loss on extinguishment of debt         $ 21,626,000 $ 0 $ 633,000  
Increase (decrease) in marginal interest rate         0.25%      
Senior secured leverage ratio         3.00      
Senior Secured Credit Facilities                
Debt Instrument [Line Items]                
Monthly basis of liquidity amount required $ 300,000,000             $ 450,000,000
Percent of domestic revenue passenger enplanements         10.00%      
Senior Secured Credit Facilities | Federal Funds Effective Rate                
Debt Instrument [Line Items]                
Marginal interest rate         0.50%      
Senior Secured Credit Facilities | LIBOR                
Debt Instrument [Line Items]                
Marginal interest rate         1.00%      
Other Term Loan B and Revolver                
Debt Instrument [Line Items]                
Increase (decrease) in marginal interest rate         (0.25%)      
Senior secured leverage ratio         2.25      
Line of Credit | Senior Secured Credit Facilities | Maximum                
Debt Instrument [Line Items]                
Total net leverage ratio       4.5        
Term Loan | Other Term Loan B                
Debt Instrument [Line Items]                
Proceeds of borrowings from lenders 637,000,000              
Marginal interest rate         4.00%      
Proceeds from debt, net of issuance costs $ 623,000,000              
Equal quarterly principal installments 0.25%              
Periodic payment         $ 54,000,000      
Excess cash flow payment percentage         50.00%      
Term Loan | Other Term Loan B | Eurocurrency                
Debt Instrument [Line Items]                
Marginal interest rate 4.00%       4.00%      
Floor interest rate 0.75%              
Term Loan | Other Term Loan B | Base Rate                
Debt Instrument [Line Items]                
Marginal interest rate 3.00%       3.00%      
Floor interest rate 1.75%              
Term Loan | Term Loan A                
Debt Instrument [Line Items]                
Marginal interest rate         2.75%      
Extinguishment of debt $ 134,000,000              
Term Loan | Term Loan B                
Debt Instrument [Line Items]                
Marginal interest rate         2.00%      
Floor interest rate         0.75%      
Term Loan | Term Loan B | Eurocurrency                
Debt Instrument [Line Items]                
Marginal interest rate         2.00%      
Term Loan | Term Loan B | Base Rate                
Debt Instrument [Line Items]                
Marginal interest rate         1.00%      
Senior Secured Notes | Term Loan A And 5.25% Senior Secured Notes                
Debt Instrument [Line Items]                
Loss on extinguishment of debt         $ 11,000,000      
Redemption premium         6,000,000      
Write-off of deferred debt issuance costs         $ 5,000,000      
Senior Secured Notes | 5.25% senior secured notes due 2023                
Debt Instrument [Line Items]                
Extinguishment of debt $ 500,000,000              
Debt instrument interest rate percentage 5.25%       5.25%      
Revolving Credit Facility                
Debt Instrument [Line Items]                
Increase in interest rate   0.25%            
Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Marginal interest rate         2.75%      
Decrease in variable basis spread, quarterly   0.25%            
Decrease in variable basis spread, maximum   0.75%            
Senior secured first-lien net leverage ratio, threshold one   3.75            
Senior secured first-lien net leverage ratio, threshold two   3.00            
Senior secured first-lien net leverage ratio, threshold three   2.25            
Senior secured leverage ratio         3.00      
Unused commitment fee percentage         0.25%      
Commitment fee percentage         0.375%      
Revolving Credit Facility | Line of Credit | Eurocurrency                
Debt Instrument [Line Items]                
Marginal interest rate         2.75%      
Revolving Credit Facility | Line of Credit | Eurocurrency | Minimum                
Debt Instrument [Line Items]                
Marginal interest rate   2.50%            
Revolving Credit Facility | Line of Credit | Eurocurrency | Maximum                
Debt Instrument [Line Items]                
Marginal interest rate   1.75%            
Revolving Credit Facility | Line of Credit | Base Rate                
Debt Instrument [Line Items]                
Marginal interest rate         1.75%      
Revolving Credit Facility | Line of Credit | Base Rate | Minimum                
Debt Instrument [Line Items]                
Marginal interest rate   1.50%            
Revolving Credit Facility | Line of Credit | Base Rate | Maximum                
Debt Instrument [Line Items]                
Marginal interest rate   0.75%            
Revolving Credit Facility | Line of Credit | LIBOR                
Debt Instrument [Line Items]                
Marginal interest rate   2.75% 2.50%