Annual report pursuant to Section 13 and 15(d)

Supplemental Information On Oil And Gas Exploration And Production Activities (Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves) (Details)

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Supplemental Information On Oil And Gas Exploration And Production Activities (Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes In Standardized Measure of Discontinued Future Net Cash Flows [Line Items]      
Sales and transfers of oil and gas produced, net of production costs $ (197,559) $ (194,893) $ (181,723)
Net changes in prices, production costs, and development costs 65,573 108,941 136,071
Acquisition of oil and gas reserves in place 0 0 72
Extensions and discoveries 130,826 151,654 107,110
Previously estimated development costs incurred during the period 43,478 10,211 41,193
Revisions of previous quantity estimates, less related production costs (3,591) (10,504) (112,553)
Sales of reserves in place 0 (214,867) 0
Accretion of discount 34,864 37,668 31,549
Net changes in income taxes (30,239) 25,585 (36,674)
Change in production rates and other 186,473 58,165 76,149
Total change in standardized measure of discounted future net cash flows 229,825 (28,040) 61,194
Diamondback Energy, Inc [Member]
      
Changes In Standardized Measure of Discontinued Future Net Cash Flows [Line Items]      
Sales and transfers of oil and gas produced, net of production costs (12,524) (11,601) 0
Net changes in prices, production costs, and development costs 3,312 (14,596) 0
Acquisition of oil and gas reserves in place 21,968 23,090 0
Extensions and discoveries 39,776 16,969 0
Previously estimated development costs incurred during the period 5,517 19,014 0
Revisions of previous quantity estimates, less related production costs (9,143) (4,897) 0
Accretion of discount 4,175 7,803 0
Net changes in income taxes (12,137) (26,866) 0
Change in production rates and other 2,862 (8,358) 0
Total change in standardized measure of discounted future net cash flows (8,339) 558 0
Equity Method Investment, Change in Ownership $ (52,145) $ 0 $ 0