Investment in American Shale Oil, LLC (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Maximum exposure to additional loss
AMSO's committed investment in AMSO, LLC based on the 2013 budget	$ 4,249
Less: cumulative capital contributions to AMSO, LLC	(2,345)
Less: liability for equity loss in AMSO, LLC at September 30, 2013	(20)
Maximum exposure to additional loss	$ 1,884

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685

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