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Fair Value Measurements - Additional Information (Details) (USD $)			3 Months Ended		3 Months Ended
	Mar. 31, 2013 Commodity derivative contracts	Dec. 31, 2012 Commodity derivative contracts	Mar. 31, 2013 Commodity derivative contracts Fair Value Measurements Level 3	Mar. 31, 2014 Commodity derivative contracts Fair Value Measurements Level 3	Mar. 31, 2014 Gulf Properties	Mar. 31, 2014 Fair Value, Measurements, Recurring	Dec. 31, 2013 Fair Value, Measurements, Recurring	Mar. 31, 2014 Fair Value, Measurements, Recurring Fair Value Measurements Level 1	Dec. 31, 2013 Fair Value, Measurements, Recurring Fair Value Measurements Level 1	Mar. 31, 2014 Fair Value, Measurements, Recurring Fair Value Measurements Level 3	Dec. 31, 2013 Fair Value, Measurements, Recurring Fair Value Measurements Level 3	Mar. 31, 2014 Fair Value, Measurements, Recurring Commodity derivative contracts	Dec. 31, 2013 Fair Value, Measurements, Recurring Commodity derivative contracts	Mar. 31, 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	Mar. 31, 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	Mar. 31, 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						$ 39,080,000	$ 68,568,000	$ 12,030,000	$ 41,663,000	$ 0	$ 0	$ 27,050,000	$ 26,905,000	$ 0	$ 0	$ 0	$ 0	$ 27,955,000	$ 0	$ 27,955,000	$ 0
Fair value inputs, probability of default					3.71%
Loss (gain) on derivative contracts			900,000
Level 3 outstanding, value	$ 211,000	$ 512,000		$ 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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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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