The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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Subsequent Events (Details) - USD ($) $ in Thousands				6 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Jul. 31, 2015	May. 29, 2015	Mar. 09, 2015	Jun. 30, 2015	Jun. 30, 2014	Jul. 30, 2015	May. 28, 2015
Subsequent Event [Line Items]
Additional investment by third party				$ 27,529	$ 0
Piceance Energy [Member]
Subsequent Event [Line Items]
Additional investment by third party		$ 13,800	$ 13,800
Ownership of Piceance Energy, LLC		34.00%		34.00%			33.34%
Piceance Energy [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Ownership of Piceance Energy, LLC	32.40%					34.00%
Unaffiliated Third Party [Member] \| Piceance Energy [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Additional investment by third party	$ 19,000