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Summary of Significant Accounting Policies - Internal Use Software, RR & IT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Internal-Use Software          
Recognized impairment of internal use software $ 0 $ 0 $ 0 $ 0  
Operating revenues:          
Allowance for doubtful accounts (in dollars) 1,140   1,140   $ 371
Asset Retirement and Environmental Remediation Obligations          
Asset retirement and environmental remediation obligations 1,700   $ 1,700   $ 1,700
Income taxes          
Minimum percentage of distribution of taxable income to qualify as REIT     90.00%    
Percentage of distribution of taxable income as per company policy     100.00%    
Provision for federal income taxes     $ 0    
Liabilities for uncertain positions $ 0   $ 0