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Subsequent Event (Notes)	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events [Text Block]	16. Subsequent Event On July 24, 2019, our Board of Trust Managers appointed D. Keith Oden from President to Executive Vice Chairman of the Board, and H. Malcolm Stewart from Chief Operating Officer to President and Chief Operating Officer. Also on July 24, 2019, our Board of Trust Managers approved the Fourth Amended and Restated Bylaws of the Company to reflect the addition of the position of Executive Vice Chairman of the Board as an officer of the Company.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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