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Acquisitions (Narrative) (Details) - Houston Interests, LLC [Member] - USD ($) $ in Thousands		6 Months Ended
	Dec. 12, 2016	Dec. 31, 2017
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Dec. 12, 2016
Business Acquisition, Name of Acquired Entity	Houston Interests, LLC
Business Combination, Consideration Transferred	$ 42,506
Working capital payment made in period not presented		$ 1,000

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e845-128460

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