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Summary of Significant Accounting Policies - Internal Use Software, RR & IT (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Internal-Use Software          
Recognized impairment of internal use software $ 0 $ 0 $ 0 $ 0  
Revenue Recognition          
Allowance for doubtful accounts (in dollars) 401   401   $ 1,094
Asset Retirement and Environmental Remediation Obligations          
Asset retirement and environmental remediation obligations 1,600   $ 1,600   $ 1,500
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