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Derivative Financial Instruments Gains and Losses (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Crude oil | Dec. 31, 2012 Crude oil | Dec. 31, 2011 Crude oil | Dec. 31, 2013 Natural Gas [Member] | Dec. 31, 2012 Natural Gas [Member] | Dec. 31, 2011 Natural Gas [Member] | Dec. 31, 2013 Natural Gas Liquids [Member] | Dec. 31, 2012 Natural Gas Liquids [Member] | Dec. 31, 2011 Natural Gas Liquids [Member] | Dec. 31, 2013 Convertible Debt [Member] | Dec. 31, 2012 Convertible Debt [Member] | Dec. 31, 2010 Convertible Debt [Member]
Derivative, (Gain) Loss on Derivative, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative cash settlement (gain) loss: | $ (22,062) | [1] | $ (44,264) | [1] | $ 25,671 | [1] | $ 15,161 | $ 11,893 | $ 22,633 | $ (30,338) | $ (47,270) | $ (10,711) | $ (6,885) | $ (8,887) | $ 13,749 |  |  |
Derivative (gain) loss | (3,080) |  | (55,630) |  | (37,086) |  | (496) | (31,981) | (3,391) | 16,285 | 31,777 | (64,310) | 3,193 | (11,162) | 4,944 |  |  |
Total derivative gain (2) | (3,080) | [2] | (55,630) | [2] | (37,086) | [2] |  |  |  |  |  |  |  |  |  |  |  |
Amount reclassified from AOCIL | 1,115 |  | (2,264) |  | 12,997 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Hedging Activity | $ (1,777) |  | $ 3,866 |  | $ (20,707) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | 3.50% | 3.50%
[1] | Total derivative cash settlement gain (loss) is reported in the derivative cash settlement gain (loss) line item on the consolidated statements of cash flows within net cash provided by operating activities.
[2] | Total derivative gain is reported in the derivative gain line item on the consolidated statements of cash flows within net cash provided by operating activities.

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- Definition Realized gain (loss) recognized in earnings from the settlement of derivative instruments not designated as hedges. + References No definition available. + Details
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- Definition Gain (loss) on derivative instruments not qualifying as hedges from changes in the fair value and realized gains (losses) on derivatives settled in cash + References No definition available. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Gain (loss) incurred in hedging activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6943989&loc=d3e3602-108585 + Details
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