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Equity Investments (Grizzly and Diamondback Balance Sheet Disclosures) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Grizzly Oil Sands ULC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets |  | $ 30,098 | $ 21,247
Noncurrent assets |  | 720,550 | 284,361
Current liabilities |  | 42,547 | 25,984
Noncurrent liabilities |  | 14,515 | 1,780
Diamondback Energy LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | 34,516 | 50,275 | 30,812
Noncurrent assets | 613,947 | 556,426 | 232,766
Current liabilities | 76,336 | 79,232 | 42,298
Noncurrent liabilities | $ 104,093 | $ 65,401 | $ 92,243

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