Annual report pursuant to Section 13 and 15(d)

Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) (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 (Unaudited) (Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash flows $ 3,043,450 $ 4,667,678 $ 1,657,708
Future development and abandonment costs (877,660) (719,898) (272,500)
Future production costs (941,243) (880,427) (274,428)
Future production taxes (58,169) (71,229) (78,647)
Future income taxes (2,648) (693,154) (172,691)
Future net cash flows 1,163,730 2,302,970 859,442
10% discount to reflect timing of cash flows (399,399) (875,803) (280,976)
Standardized measure of discounted future net cash flows 764,331 1,427,167 578,466
Diamondback Energy, Inc      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash flows 0 0 331,505
Future development and abandonment costs 0 0 (37,229)
Future production costs 0 0 (58,096)
Future production taxes 0 0 (22,925)
Future income taxes 0 0 (48,547)
Future net cash flows 0 0 164,708
10% discount to reflect timing of cash flows 0 0 (94,462)
Standardized measure of discounted future net cash flows 0 0 70,246
Investment in Grizzly Oil Sands ULC      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash flows 0 754,720 0
Future development and abandonment costs 0 (205,242) 0
Future production costs 0 (291,988) 0
Future production taxes 0 0 0
Future income taxes 0 (11,250) 0
Future net cash flows $ 0 246,240 0
10% discount to reflect timing of cash flows (152,494) 0
Standardized measure of discounted future net cash flows $ 0 $ 93,746 $ 0