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Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) (Costs Incurred In Oil and Gas Property Acquisition and Development Activities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition | $ 810,755 | $ 440,288 | $ 338,153
Development of proved undeveloped properties | 642,811 | 864,511 | 408,121
Exploratory | 0 | 2,249 | 26,174
Recompletions | 13,894 | 45,658 | 44,633
Capitalized asset retirement obligation | 8,800 | 2,095 | 3,556
Total | 1,476,260 | 1,354,801 | 820,637
Diamondback Energy, Inc |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition | 0 | 0 | 44,534
Development of proved undeveloped properties | 0 | 0 | 6,369
Exploratory | 0 | 0 | 17,491
Capitalized asset retirement obligation | 0 | 0 | 50
Total | 0 | 0 | 68,444
Investment in Grizzly Oil Sands ULC |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Acquisition | 396 | 1,230 | 0
Development of proved undeveloped properties | $ 47 | 7,107 | 0
Exploratory |  | 0 | 0
Capitalized asset retirement obligation | $ 282 | 1,055 | 0
Total | $ 725 | $ 9,392 | $ 0

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- Definition Total costs incurred in oil and gas properties acquisition and development activities + References No definition available. + Details
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- Definition Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62014-109447 + Details
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- Definition Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) 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 + Details
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- Definition Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62014-109447 + Details
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- Definition Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Exploration -URI http://asc.fasb.org/extlink&oid=6512329 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62014-109447 + Details
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