Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v3.19.3.a.u2
Subsequent Events (Details)
1 Months Ended 12 Months Ended
Feb. 21, 2020
USD ($)
a
Feb. 27, 2020
$ / shares
Dec. 31, 2017
USD ($)
Subsequent Event [Line Items]      
Payments to acquire land | $     $ 0
Subsequent event      
Subsequent Event [Line Items]      
Sub-share declared (in USD per share) | $ / shares   $ 10.00  
Surface acres of land acquired (in acres) | a 671    
Net royalty interests (in acres) | a 755    
Payments to acquire land | $ $ 14,900,000    
Special | Subsequent event      
Subsequent Event [Line Items]      
Sub-share declared (in USD per share) | $ / shares   $ 6.00