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Debt (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 11, 2019
USD ($)
item
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 24, 2021
USD ($)
Debt Instrument [Line Items]        
Debt service guaranty liability   $ 53,650 $ 53,650  
Debt instruments collateral value   605,700 634,400  
Unsecured notes payable under credit facilities   4,002 40,000  
Finance lease obligation   21,633 $ 21,696  
Net premium/(discount) on debt   (2,700)    
Deferred finance costs, net   (3,900)    
Non-cash debt   4,900    
Unsecured Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity under credit facility $ 500,000      
Number of credit facility 6-month extensions | item 2      
Line of credit facility, extension period 6 months      
Bids amount (up to)   250,000    
Maximum increase in credit facility amount (up to)   $ 850,000    
Commitment fee percentage   0.15% 0.15%  
Unsecured notes payable under credit facilities   $ 0 $ 40,000  
Debt Service Guaranty [Member]        
Debt Instrument [Line Items]        
Debt coverage ratio   1.4    
Short-Term Unsecured Facility [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity under credit facility       $ 10,000
Commitment fee percentage   0.10% 0.10%  
Unused capacity, commitment fee percentage   0.05% 0.05%  
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate   0.825% 0.825%  
Thirty-Day LIBOR [Member] | Short-Term Unsecured Facility [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.25% 1.25%  
Financial Standby Letter of Credit [Member]        
Debt Instrument [Line Items]        
Securities pledged as collateral   $ 6,000 $ 6,000  
Guarantor obligations, maximum exposure, undiscounted   $ 6,000 $ 6,000