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Equity Investments (Grizzly and Diamondback Income Statement Disclosures) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Grizzly Oil Sands ULC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gross revenue |  |  | $ 0 | $ 0 | $ 0
Net income (loss) |  |  | (6,050) | (6,605) | (3,234)
Diamondback Energy LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gross revenue | 28,909 | 16,351 | 74,962 | 49,366 | 27,253
Income from operations | 8,662 | 6,737 |  |  |
Income from operations |  |  | 17,307 | 15,147 | 9,181
Net income (loss) | $ 5,396 | $ 1,477 | $ (36,521) | $ (386) | $ 8,231

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