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Derivatives - Fair Value of Derivative Contracts (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Derivative assets | $ 50,274 | $ 130,403
Derivative liabilities | (78,200) | (110,411)
Total net derivative contracts | (27,926) | 19,992
Current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 18,368 | 91,346
Current assets | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 15,887 | 88,052
Current assets | Oil basis swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0 | 183
Current assets | Natural gas price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 1,598 | 0
Current assets | Oil collars - three way |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 706 | 0
Current assets | Natural gas collars |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 177 | 3,111
Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 31,906 | 39,057
Noncurrent assets | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 19,376 | 37,983
Noncurrent assets | Oil collars - three way |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 12,189 | 190
Noncurrent assets | Natural gas collars |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 341 | 884
Current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (39,856) | (35,184)
Current liabilities | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (38,396) | (31,991)
Current liabilities | Oil basis swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 0 | (695)
Current liabilities | Natural gas price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (1,460) | 0
Current liabilities | Oil collars - two way |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 0 | (103)
Current liabilities | Interest rate swap |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 0 | (2,395)
Noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (38,344) | (75,227)
Noncurrent liabilities | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (38,344) | (67,900)
Noncurrent liabilities | Oil collars - three way |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | $ 0 | $ (7,327)

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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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