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Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v3.10.0.1
Subsequent Events (Details) - Subsequent Event
$ / shares in Units, $ in Millions
 1 Months Ended
Feb. 22, 2019
USD ($)
a
Jan. 07, 2019
USD ($)
a
Feb. 28, 2019
$ / shares
Subsequent Event [Line Items] Ìý Ìý Ìý
Sub-share declared (in dollars per share) | $ / shares Ìý Ìý $ 1.75
Special Ìý Ìý Ìý
Subsequent Event [Line Items] Ìý Ìý Ìý
Sub-share declared (in dollars per share) | $ / shares Ìý Ìý $ 4.25
Loving County Ìý Ìý Ìý
Subsequent Event [Line Items] Ìý Ìý Ìý
Real estate sold (in acres) | a Ìý 14,000 Ìý
Sales of real estate | $ Ìý $ 100.0 Ìý
Mineral or royalty interest in real estate sold (in acres) | a Ìý 1,280 Ìý
Reeves and Culberson Counties Ìý Ìý Ìý
Subsequent Event [Line Items] Ìý Ìý Ìý
Payments to acquire land | $ $ 46.9 Ìý Ìý
Real estate acquired, acres (Acre) | a 11,700 Ìý Ìý
Scenario, Forecast | Reeves and Culberson Counties Ìý Ìý Ìý
Subsequent Event [Line Items] Ìý Ìý Ìý
Proceeds from Sale of Real Estate Held-for-investment | $ $ 53.1 Ìý Ìý