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Equity Investments (Investments Accounted For By The Equity Method) (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 17, 2012
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Dec. 31, 2011
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | $ 451,592,000 | $ 381,484,000 | $ 86,824,000 | |
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Tatex Thailand II, LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 15,000 | 203,000 | 1,030,000 | |
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Tatex Thailand III, LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 8,639,000 | 8,657,000 | 8,282,000 | |
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Grizzly Oil Sands ULC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 176,196,000 | 172,766,000 | 69,008,000 | |
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Bison Drilling And Field Services LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 13,988,000 | 13,518,000 | 6,366,000 | |
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Muskie Holdings LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 7,702,000 | 7,320,000 | 2,138,000 | |
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Timber Wolf Terminals LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 870,000 | 878,000 | ||
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Windsor Midstream LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 9,887,000 | 9,503,000 | ||
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Stingray Pressure Pumping LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 15,718,000 | 13,265,000 | ||
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Stingray Cementing LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 3,088,000 | 3,110,000 | ||
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Blackhawk Midstream LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 0 | 0 | 0 | |
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Stingray Logistics LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 928,000 | 947,000 | 0 | |
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Diamondback Energy LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | 212,413,000 | 151,317,000 | 138,496,000 | 0 |
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Stingray Energy Services LLC [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||
| Equity investments | $ 2,148,000 | $ 0 |