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Revisions of Prior Period Financial Statements (Narrative) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Operating costs and expenses   $ 93,597 $ 65,985 $ 66,222
Minimum        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Rental arrangements, original term   6 months    
Maximum        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Rental arrangements, original term   60 months    
Revisions | Revision Of Prior Period Financial Statements        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Operating costs and expenses $ 1,100   $ 1,145 $ 96