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Debt (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 11, 2019
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 03, 2020
USD ($)
Debt Instrument [Line Items]          
Debt service guaranty liability   $ 53,650 $ 57,380    
Principal payments of debt   22,977 55,556 $ 257,028  
Debt instruments collateral value   600,000 500,000    
Outstanding revolving credit facility   40,000      
Finance lease obligation   21,696 $ 21,804    
Net premium/(discount) on debt   (3,100)      
Deferred finance costs, net   (4,500)      
Non-cash debt   5,300      
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%    
Outstanding revolving credit facility   $ 40,000      
Debt Service Guaranty [Member]          
Debt Instrument [Line Items]          
Debt coverage ratio   1.4      
Mortgages [Member]          
Debt Instrument [Line Items]          
Principal payments of debt     $ 50,000    
Debt stated interest rate     7.00%    
Secured Debt [Member]          
Debt Instrument [Line Items]          
Deferred finance costs, net   $ (800)      
Non-cash debt   $ 5,300      
Short-Term Unsecured Facility [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity under credit facility         $ 10,000
Fixed interest rate loan period (in days)   30 days 30 days    
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 $ 5,300    
Guarantor obligations, maximum exposure, undiscounted   $ 6,000 $ 5,000