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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Variable Interest Entity |  |  |  |  |  |
Cash and cash equivalents | $ 1,179,644,000 |  | $ 814,663,000 |  | $ 1,308,733,000 | $ 309,766,000
Accounts receivable, net | 293,765,000 |  | 349,218,000 |  |  |
Derivative contracts | 9,002,000 |  | 12,779,000 |  |  |
Total current assets | 1,525,945,000 |  | 1,241,823,000 |  |  |
Investment in royalty interests(2) | 10,735,993,000 |  | 11,504,422,000 |  |  |
Less: accumulated depletion and impairment(3) | (6,043,109,000) |  | (5,762,969,000) |  |  |
Investment in royalty interests, net | 4,692,884,000 |  | 5,741,453,000 |  |  |
Derivative contracts | 18,048,000 |  | 14,126,000 |  |  |
Accounts payable and accrued expenses | 581,764,000 |  | 812,488,000 |  |  |
Royalty Trusts |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Cash and cash equivalents | 7,241,000 | [1] | 7,912,000 | [1] |  |
Accounts receivable, net | 22,453,000 |  | 22,540,000 |  |  |
Derivative contracts | 3,300,000 |  | 4,983,000 |  |  |
Total current assets | 32,994,000 |  | 35,435,000 |  |  |
Investment in royalty interests(2) | 1,325,942,000 | [2] | 1,325,942,000 | [2] |  |
Less: accumulated depletion and impairment(3) | (243,971,000) | [3] | (186,095,000) | [3] |  |
Investment in royalty interests, net | 1,081,971,000 |  | 1,139,847,000 |  |  |
Derivative contracts | 0 |  | 1,476,000 |  |  |
Total assets | 1,114,965,000 |  | 1,176,758,000 |  |  |
Accounts payable and accrued expenses | 2,157,000 |  | 3,393,000 |  |  |
Total liabilities | $ 2,157,000 |  | $ 3,393,000 |  |  |
[1] | Includes $3.0 million held by the trustee at March 31, 2014 and December 31, 2013 as reserves for future general and administrative expenses.
[2] | Investment in royalty interests is included in oil and natural gas properties in the accompanying unaudited condensed consolidated balance sheets.
[3] | Accumulated depletion and impairment at March 31, 2014 includes full cost ceiling limitation impairment allocated to the Royalty Trusts of $42.3 million. There was no full cost ceiling limitation impairment allocated to the Royalty Trusts as of December 31, 2013.

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