Annual report pursuant to Section 13 and 15(d)

SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate and Accumulated Depreciation (Details)

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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate and Accumulated Depreciation (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Dec. 21, 2018
Investment in real estate:            
Balance, beginning of year $ 485,037,215 $ 485,037,215 $ 485,368,450 $ 538,112,220    
Addition: Acquisition and developments   361,196 24,877 3,599    
Deduction: Dispositions and other   (413,628,234) (356,112) (52,747,369)    
Balance, end of year   71,770,177 485,037,215 485,368,450    
Accumulated depreciation:            
Balance, beginning of year 105,825,816 105,825,816 87,154,095 72,155,753    
Addition: Depreciation   9,748,659 18,671,721 20,986,461    
Deduction: Dispositions and other   (108,742,308) 0 (5,988,119)    
Balance, end of year   6,832,167 105,825,816 $ 87,154,095    
Assets Leased to Others            
Accumulated depreciation:            
Net carrying value of leased properties   64,938,010 379,211,399      
Accumulated depreciation   6,832,167 $ 105,825,816      
Pinedale LGS            
Accumulated depreciation:            
Net carrying value of leased properties         $ 164,500,000  
Pinedale LGS | Assets Leased to Others            
Accumulated depreciation:            
Net carrying value of leased properties         164,500,000  
Gross investment         230,600,000  
Accumulated depreciation         $ 66,100,000  
Portland Terminal Facility | Assets Leased to Others            
Accumulated depreciation:            
Net carrying value of leased properties           $ 45,700,000
Gross investment           51,700,000
Accumulated depreciation           $ 6,000,000.0
Grand Isle Gathering System            
Investment in real estate:            
Balance, end of year 183,000,000.0 70,244,151        
Accumulated depreciation:            
Balance, end of year 42,700,000 6,615,216        
Long-lived asset impairment $ 140,300,000          
Net carrying value of leased properties   $ 63,600,000