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Debt (Narrative) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 11, 2019
USD ($)
item
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 03, 2020
USD ($)
Debt Instrument [Line Items]          
Debt service guaranty liability   $ 57,380   $ 57,380  
Principal payments of debt   21,542 $ 54,226    
Debt instruments collateral value   494,200   463,700  
Finance lease obligation   21,723   $ 21,804  
Net premium/(discount) on debt   (3,300)      
Deferred finance costs, net   (4,800)      
Non-cash debt   1,700      
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   $ 0   $ 0  
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%  
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   $ 5,300   $ 5,300  
Guarantor obligations, maximum exposure, undiscounted   $ 5,000   $ 5,000