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Equity Investments (Investments Accounted For By The Equity Method) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Dec. 17, 2012
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | $ 451,592 | $ 381,484 |
Tatex Thailand II, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 15 | 203 |
Tatex Thailand III, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 8,639 | 8,657 |
Grizzly Oil Sands ULC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 176,196 | 172,766 |
Bison Drilling And Field Services LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 13,988 | 13,518 |
Muskie Holdings LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 7,702 | 7,320 |
Timber Wolf Terminals LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 870 | 878 |
Windsor Midstream LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 9,887 | 9,503 |
Stingray Pressure Pumping LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 15,718 | 13,265 |
Stingray Cementing LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 3,088 | 3,110 |
Blackhawk Midstream LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 0 | 0 |
Stingray Logistics LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 928 | 947 |
Diamondback Energy LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | 212,413 | 151,317 | 138,500
Stingray Energy Services LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | $ 2,148 | $ 0 |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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