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Debt Obligations (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Apr. 13, 2021
Dec. 31, 2020
Jan. 28, 2020
Sep. 25, 2017
Debt Instrument [Line Items]                  
Long term obligations $ 1,399,092   $ 1,399,092       $ 1,479,077    
Line of Credit Facility, Maximum Borrowing Capacity 800,000   800,000            
Unsecured Debt 697,168   697,168       493,376    
Proceeds from Issuance of Unsecured Debt     207,400 $ 500,000          
Convertible Debt 226,977   226,977       222,391    
Write off of Deferred Debt Issuance Cost 6,505 $ 0 6,505 0          
Aircraft loans [Member]                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Line of Credit Arrangements, Net             7,000    
Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Line of Credit Arrangements, Net 8,200   8,200       6,600    
Unsubordinated term loan and Revolving credit facility [Member]                  
Debt Instrument [Line Items]                  
Maximum amount of common stock authorized for repurchase     100,000            
Unsubordinated term loan [Member]                  
Debt Instrument [Line Items]                  
Long term obligations 0   0       612,169    
Revolving credit facility [Member]                  
Debt Instrument [Line Items]                  
Long term obligations 464,000   $ 464,000       140,000    
Variable interest rate     1.33%            
Credit facility, revolving credit loan, remaining borrowing capacity 321,700   $ 321,700            
Line of Credit Facility, Maximum Amount Outstanding During Period     250,000            
Bonds [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt           $ 200,000   $ 500,000  
Debt Instrument, Interest Rate, Stated Percentage               4.75%  
Proceeds from Issuance of Unsecured Debt     $ 205,500 $ 495,000          
Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Variable interest rate     4.75%            
Convertible Debt [Member]                  
Debt Instrument [Line Items]                  
Convertible Debt 258,750   $ 258,750       258,750   $ 258,800
Debt Conversion, Converted Instrument, Rate     1.125%            
Proceeds from Convertible Debt         $ 252,300        
Convertible note hedge shares                 8,100
Warrants and Rights Outstanding 38,500   $ 38,500            
Unamortized Debt Issuance Expense (3,396)   (3,396)       (3,894)    
Debt Instrument, Unamortized Discount $ (28,377)   $ (28,377)       $ (32,465)    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]                  
Debt Instrument [Line Items]                  
Convertible note hedge fair value                 $ 56,100