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Acquisitions and Dispositions	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisitions and Dispositions	(2) Acquisitions and Dispositions: Historically the Company has repurchased the interests of the partners and trust unit holders in the oil and gas limited partnerships (the “Partnerships”) and the asset and business income trusts (the “Trusts”) managed by the Company as general partner and as managing trustee, respectively. The Company purchased such interests in amounts totaling $60,000 and $176,000 for the six months ended June 30, 2017 and 2016, respectively. During the six months ended June 30, 2017, The Company sold or farmed out interests in certain non-core undeveloped oil and natural gas properties through a number of separate individually negotiated transactions in exchange for cash and a royalty or working interest in both West Texas and Oklahoma. Proceeds under these agreements were $46.6 million. In July 2017, The Company closed on a similar transaction in New Mexico for proceeds of $400,000. During the second quarter of 2017, The Company acquired approximately 118 net mineral acres for $596,000 adjacent to existing Company acreage in order to facilitate the drilling of future horizontal wells.

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- Definition

The entire disclosure for business combinations, including leverage buyout transactions (as applicable), and divestitures. This may include a description of a business combination or divestiture (or series of individually immaterial business combinations or divestitures) completed during the period, including background, timing, and assets and liabilities recognized and reclassified or sold. This element does not include fixed asset sales and plant closings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-URI http://asc.fasb.org/subtopic&trid=2122178

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-URI http://asc.fasb.org/topic&trid=2303972

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