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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 309,766 |  | $ 207,681 |  | $ 5,863 | $ 7,861
Accounts receivable | 445,506 |  | 206,336 |  |  |
Derivative contracts | 71,022 |  | 4,066 |  |  |
Total current assets | 1,142,885 |  | 441,840 |  |  |
Derivative contracts | 23,617 |  | 26,415 |  |  |
Total assets | 9,790,731 |  | 6,219,609 |  |  |
Accounts payable and accrued expenses | 766,544 |  | 506,784 |  |  |
Total liabilities | 5,928,276 |  | 3,670,659 |  |  |
Royalty Trusts |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 7,445 | [1] | 3,151 | [1] |  |
Accounts receivable | 28,596 |  | 18,357 |  |  |
Derivative contracts | 10,286 |  | 1,499 |  |  |
Total current assets | 46,327 |  | 23,007 |  |  |
Investment in royalty interests | 1,325,942 | [2] | 858,795 | [2] |  |
Less: accumulated depletion | (103,746) |  | (24,404) |  |  |
Investment in royalty interests, net total | 1,222,196 |  | 834,391 |  |  |
Derivative contracts | 7,660 |  | 5,668 |  |  |
Total assets | 1,276,183 |  | 863,066 |  |  |
Accounts payable and accrued expenses | 1,101 |  | 486 |  |  |
Total liabilities | $ 1,101 |  | $ 486 |  |  |
[1] | Includes $3.0 million and $2.0 million held by the trustee at December 31, 2012 and 2011, respectively, as reserves for future general and administrative expenses.
[2] | Investment in royalty interests is included in oil and natural gas properties in the accompanying consolidated balance sheets, and was determined by allocating the historical net book value of the Company’s full cost pool based on the fair value of each Royalty Trust’s royalty interests relative to the fair value of the Company’s full cost pool.

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- Definition The cumulative amount of depreciation, depletion and impairment (related to oil and gas property accounted for under the full cost method) that has been recognized in the income statement. + References No definition available. + Details
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