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Capital Transactions - Information About Stock Options Outstanding (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Options Exercisable    
Borrowed amount $ 3,236,002,000 $ 3,017,523,000
Employee stock options | $13.00 to $13.99    
Stock options, exercise price    
Exercise price range, low end of range (in dollars per share) $ 13.00  
Exercise price range, high end of range (in dollars per share) $ 13.99  
Options Outstanding    
Number of options outstanding (in shares) 2,034  
Options outstanding, Weighted Average Remaining Contractual Life 1 month 6 days  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 13.51  
Options Exercisable    
Number of options Exercisable (in shares) 2,034  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 13.51  
Employee stock options | $14.00 to $15.00    
Stock options, exercise price    
Exercise price range, low end of range (in dollars per share) 14.00  
Exercise price range, high end of range (in dollars per share) $ 15.00  
Options Outstanding    
Number of options outstanding (in shares) 55,619  
Options outstanding, Weighted Average Remaining Contractual Life 1 year 1 month 6 days  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 14.78  
Options Exercisable    
Number of options Exercisable (in shares) 55,619  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 14.78  
Employee stock options | $13.00 to $15.00    
Stock options, exercise price    
Exercise price range, low end of range (in dollars per share) 13.00  
Exercise price range, high end of range (in dollars per share) $ 15.00  
Options Outstanding    
Number of options outstanding (in shares) 57,653  
Options outstanding, Weighted Average Remaining Contractual Life 1 year 1 month 6 days  
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 14.74  
Options Exercisable    
Number of options Exercisable (in shares) 57,653  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 14.74  
PSP agreement | Warrant Shares    
Options Exercisable    
Warrants to purchase shares 370,720  
Warrants exercise price $ 28.38  
Warrant term 5 years  
Weighted average fair value of the warrants $ 13.57  
Secured loan    
Options Exercisable    
Warrants to purchase shares 211,416  
Warrants exercise price $ 28.38  
Warrant term 5 years  
Weighted average fair value of the warrants $ 15.22  
Borrowed amount $ 60,000,000