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Fair Value Measurements - Additional Information (Details) (USD $) In Thousands, unless otherwise specified					6 Months Ended
	Jun. 30, 2013 Commodity derivative contracts	Mar. 31, 2013 Commodity derivative contracts	Dec. 31, 2012 Commodity derivative contracts	Jun. 30, 2014 Commodity derivative contracts Fair Value Measurements Level 3	Jun. 30, 2014 Gulf Properties	Jun. 30, 2014 Fair Value, Measurements, Recurring	Dec. 31, 2013 Fair Value, Measurements, Recurring	Jun. 30, 2014 Fair Value, Measurements, Recurring Fair Value Measurements Level 1	Dec. 31, 2013 Fair Value, Measurements, Recurring Fair Value Measurements Level 1	Jun. 30, 2014 Fair Value, Measurements, Recurring Fair Value Measurements Level 3	Dec. 31, 2013 Fair Value, Measurements, Recurring Fair Value Measurements Level 3	Jun. 30, 2014 Fair Value, Measurements, Recurring Commodity derivative contracts	Dec. 31, 2013 Fair Value, Measurements, Recurring Commodity derivative contracts	Jun. 30, 2014 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 1	Dec. 31, 2013 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 1	Jun. 30, 2014 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 3	Dec. 31, 2013 Fair Value, Measurements, Recurring Commodity derivative contracts Fair Value Measurements Level 3	Dec. 31, 2013 Fair Value, Measurements, Recurring Restricted deposits	Jun. 30, 2014 Fair Value, Measurements, Recurring Restricted deposits Fair Value Measurements Level 1	Dec. 31, 2013 Fair Value, Measurements, Recurring Restricted deposits Fair Value Measurements Level 1	Dec. 31, 2013 Fair Value, Measurements, Recurring Restricted deposits Fair Value Measurements Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets measured at fair value						$ 13,681	$ 68,568	$ 10,740	$ 41,663	$ 0	$ 0	$ 2,941	$ 26,905	$ 0	$ 0	$ 0	$ 0	$ 27,955	$ 0	$ 27,955	$ 0
Fair value inputs, probability of default					3.71%
Level 3 outstanding, value	$ 0	$ (211)	$ (512)	$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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