Real Estate Activity - Schedule of Land and Real Estate Ownership (Details) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2019
USD ($)
a
county
|
Dec. 31, 2018
USD ($)
a
county
|
|
| Number of Acres | ||
| Land (surface rights) (acre) | a | 856,211 | 877,462 |
| Real estate acquired (acre) | a | 36,416 | 24,715 |
| Total real estate situated in 19 counties in Texas (acre) | a | 892,627 | 902,177 |
| Net Book Value | ||
| Land (surface rights) | $ | $ 0 | $ 0 |
| Real estate acquired | $ | 57,682 | 10,492 |
| Total real estate situated in 19 counties in Texas | $ | $ 57,682 | $ 10,492 |
| Number of counties with real estate in Texas | county | 19 | 19 |
| X | ||||||||||
- Definition Acres [Abstract] No definition available.
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- Definition Land (Surface Rights), Carrying Value No definition available.
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- Definition Net Book Value of Royalty Interests [Abstract] No definition available.
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- Definition Number of Counties with Land Surface Rights No definition available.
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- Definition Surface rights in acre as part of land owned. No definition available.
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- Definition Total Real Estate Including Land Surface Rights No definition available.
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- Definition Total Real Estate and Land Surface Rights, Acres No definition available.
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- Definition Area of a real estate property. No definition available.
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- Definition Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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