Supplemental Disclosures to the Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Net cash provided by operating activities included:
Cash payments for interest	$ 56,419	$ 53,199
Interest capitalized	(6,290)	(7,549)
Cash payments for interest, net of amounts capitalized	50,129	45,650
Cash payments for income taxes	591	240
Non-cash investing activities included:
Asset retirement obligation additions	2,966	262
Oil and natural gas properties acquired through increase in accounts payable and accrued liabilities	$ 20,768	$ 19,613

Oil and natural gas properties acquired through increase (decrease) in accounts payable and accrued liabilities

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- Definition

Amount of asset retirement obligations incurred during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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- Definition

The amount of cash paid during the current period for interest that is capitalized.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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