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Equity Investments (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |
Investments Accounted For By The Equity Method | Investments accounted for by the equity method consist of the following as of March 31, 2013 and December 31, 2012:
| March 31, 2013 |  | December 31, 2012
| (In thousands)
Investment in Tatex Thailand II, LLC | $ | 15 |  |  | $ | 203 |
Investment in Tatex Thailand III, LLC | 8,639 |  |  | 8,657 |
Investment in Grizzly Oil Sands ULC | 176,196 |  |  | 172,766 |
Investment in Bison Drilling and Field Services LLC | 13,988 |  |  | 13,518 |
Investment in Muskie Holdings LLC | 7,702 |  |  | 7,320 |
Investment in Timber Wolf Terminals LLC | 870 |  |  | 878 |
Investment in Windsor Midstream LLC | 9,887 |  |  | 9,503 |
Investment in Stingray Pressure Pumping LLC | 15,718 |  |  | 13,265 |
Investment in Stingray Cementing LLC | 3,088 |  |  | 3,110 |
Investment in Blackhawk Midstream LLC | — |  |  | — |
Investment in Stingray Logistics LLC | 928 |  |  | 947 |
Investment in Diamondback Energy LLC | 212,413 |  |  | 151,317 |
Investment in Stingray Energy Services LLC | 2,148 |  |  | — |
| $ | 451,592 |  |  | $ | 381,484 |
| Investments accounted for by the equity method consist of the following as of December 31, 2012 and 2011:
| December 31,
| 2012 |  | 2011
Investment in Tatex Thailand II, LLC | $ | 203,000 |  |  | $ | 1,030,000 |
Investment in Tatex Thailand III, LLC | 8,657,000 |  |  | 8,282,000 |
Investment in Grizzly Oil Sands ULC | 172,766,000 |  |  | 69,008,000 |
Investment in Bison Drilling and Field Services LLC | 13,518,000 |  |  | 6,366,000 |
Investment in Muskie Holdings LLC | 7,320,000 |  |  | 2,138,000 |
Investment in Timber Wolf Terminals LLC | 878,000 |  |  | — |
Investment in Windsor Midstream LLC | 9,503,000 |  |  | — |
Investment in Stingray Pressure Pumping LLC | 13,265,000 |  |  | — |
Investment in Stingray Cementing LLC | 3,110,000 |  |  | — |
Investment in Blackhawk Midstream LLC | — |  |  | — |
Investment in Stingray Logistics LLC | 947,000 |  |  | — |
Investment in Diamondback Energy LLC | 151,317,000 |  |  | — |
| $ | 381,484,000 |  |  | $ | 86,824,000 |
Equity Method Investment, Balance Sheet Summary | The table below summarizes balance sheet information for Diamondback as of March 31, 2013 and December 31, 2012:
| March 31, 2013 |  | December 31, 2012
| (In thousands)
Current assets | $ | 34,516 |  |  | $ | 50,275 |
Noncurrent assets | $ | 613,947 |  |  | $ | 556,426 |
Current liabilities | $ | 76,336 |  |  | $ | 79,232 |
Noncurrent liabilities | $ | 104,093 |  |  | $ | 65,401 |
Equity Method Investment, Income Statement Summary | The table below summarizes the results of operations for Diamondback three months ended March 31, 2013 and 2012, respectively:
| Three Months Ended March 31,
| 2013 |  | 2012
| (In thousands)
Gross revenue | $ | 28,909 |  |  | $ | 16,351 |
Income from operations | $ | 8,662 |  |  | $ | 6,737 |
Net income | $ | 5,396 |  |  | $ | 1,477 |
Grizzly Oil Sands ULC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments Accounted For By The Equity Method |  | The tables below summarize financial information for Grizzly as of December 31, 2012, 2011 and 2010: Summarized balance sheet information:
| December 31,
| 2012 |  | 2011 |
Current assets | $ | 30,098,000 |  |  | $ | 21,247,000 |  |
Noncurrent assets | $ | 720,550,000 |  |  | $ | 284,361,000 |  |
Current liabilities | $ | 42,547,000 |  |  | $ | 25,984,000 |  |
Noncurrent liabilities | $ | 14,515,000 |  |  | $ | 1,780,000 |  |
Summarized results of operations:
| December 31,
| 2012 |  | 2011 |  | 2010
Gross revenue | $ | — |  |  | $ | — |  |  | $ | — |
Net loss | $ | 6,050,000 |  |  | $ | 6,605,000 |  |  | $ | 3,234,000 |
Diamondback Energy LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments Accounted For By The Equity Method |  | The tables below summarize financial information for Diamondback as of December 31, 2012, 2011 and 2010: Summarized balance sheet information:
| December 31,
| 2012 |  | 2011
Current assets | $ | 50,275,000 |  |  | $ | 30,812,000 |
Noncurrent assets | $ | 556,426,000 |  |  | $ | 232,766,000 |
Current liabilities | $ | 79,232,000 |  |  | $ | 42,298,000 |
Noncurrent liabilities | $ | 65,401,000 |  |  | $ | 92,243,000 |
Summarized results of operations:
| December 31,
| 2012 |  | 2011 |  | 2010
Gross revenue | $ | 74,962,000 |  |  | $ | 49,366,000 |  |  | $ | 27,253,000 |
Income from operations | $ | 17,307,000 |  |  | $ | 15,147,000 |  |  | $ | 9,181,000 |
Net income (loss) | $ | (36,521,000 | ) |  | $ | (386,000 | ) |  | $ | 8,231,000 |

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- Definition Tabular disclosure of equity method investments in common stock. The disclosure may include: (a) the name of each investee or group of investments for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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