Business Combinations - Purchase Allocation for Acquired Assets and Liabilities and Non Controlling Interests (Details) - Kern Phase 1(a) Assets - USD ($) $ in Thousands	Feb. 29, 2016	Jan. 26, 2016
Business Acquisition [Line Items]
Property and equipment	$ 9,733
Related party payable	(3,435)
Asset retirement obligation	(547)
Noncontrolling interest	(864)	$ (864)
Net assets acquired	$ 4,887

Business combination recognized identifiable assets acquired and liabilities assumed asset retirement obligation.

No definition available.

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Period Type:	instant

- Definition

Business combination recognized identifiable assets acquired and liabilities assumed related parties payable.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree.

+ References

+ Details

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