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INVESTMENTS - AllDale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in equity method investment
Beginning balance	$ 161,309
Equity method investment income (loss)	2,203	$ 22,189	$ 13,860
Ending balance	28,529	161,309
All Dale Minerals III
Changes in equity method investment
Beginning balance	28,974	14,182
Contributions		15,600	14,400
Equity method investment income (loss)	2,203	547	(218)
Distributions received	(2,648)	(1,355)
Ending balance	$ 28,529	$ 28,974	$ 14,182

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- Definition

The amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element includes distributions that constitute a return of investment.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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