Acquisitions and Divestitures (Value Net Assets Acquired) (Details) - USD ($) $ in Thousands	Nov. 22, 2016	Oct. 14, 2015	Mar. 31, 2015
Eagle Ford
Business Acquisition [Line Items]
Proved developed reserves	$ 26,454		$ 72,889
Facilities			8,002
Fair value of hedges assumed			3,408
Fair value of assets acquired	26,454		84,299
Asset retirement obligations	(832)		(877)
Ad valorem tax liability			(44)
Fair value of net assets acquired	$ 25,622		$ 83,378
Western Catarina Midstream
Business Acquisition [Line Items]
Fixed assets		$ 142,887
Contractual customer relationships		201,888
Purchase of SPP common units from SN		1,065
Fair value of assets acquired		$ 345,840

Business Combination, Recognized Assets Acquired and Liabilities Assumed, Ad Valorem Tax Liability

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Business Combination, Recognized Assets Acquired and Liabilities Assumed, Asset Retirement Obligations

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Represents the amount of repurchased common shares as of the acquisition date.

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Amount of assets acquired at the acquisition date.

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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The amount of financial assets (as defined) recognized as of the acquisition date.

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Amount of real estate acquired, at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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