Quarterly report pursuant to Section 13 or 15(d)

Management Agreement (Details)

v3.20.2
Management Agreement (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Aug. 12, 2019
Jun. 29, 2015
Corridor Infra Trust Management                  
Management Agreement [Line Items]                  
Incentive fee $ 0 $ 0 $ 171,000            
General and Administrative Expense | Corridor Infra Trust Management                  
Management Agreement [Line Items]                  
Fees incurred under Management Agreement 932,000     $ 1,600,000 $ 4,100,000 $ 5,200,000      
Payments to administrator pursuant to Administrative Agreement $ 37,000     $ 64,000 $ 166,000 $ 200,000      
5.875% Convertible Senior Notes | Convertible Debt                  
Management Agreement [Line Items]                  
Interest rate 5.875%       5.875%   5.875% 5.875%  
7.00% Convertible Senior Notes | Convertible Debt                  
Management Agreement [Line Items]                  
Interest rate 7.00%       7.00%   7.00%   7.00%