Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Details) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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Jun. 30, 2013
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Dec. 31, 2012
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Variable Interest Entity | ||||||||||||
Cash and cash equivalents | $ 918,758,000 | $ 814,663,000 | $ 1,094,341,000 | $ 309,766,000 | ||||||||
Accounts receivable, net | 333,300,000 | 349,218,000 | ||||||||||
Derivative contracts | 115,000 | 12,779,000 | ||||||||||
Total current assets | 1,289,616,000 | 1,241,823,000 | ||||||||||
Investment in royalty interests(2) | 11,116,131,000 | 11,504,422,000 | ||||||||||
Less: accumulated depletion and impairment(3) | (6,138,833,000) | (5,762,969,000) | ||||||||||
Investment in royalty interests, net | 4,977,298,000 | 5,741,453,000 | ||||||||||
Derivative contracts | 2,826,000 | 14,126,000 | ||||||||||
Accounts payable and accrued expenses | 631,658,000 | 812,488,000 | ||||||||||
Derivative contracts, current | 56,728,000 | 34,267,000 | ||||||||||
Royalty Trusts
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Variable Interest Entity | ||||||||||||
Cash and cash equivalents | 6,722,000 | [1] | 7,912,000 | [1] | ||||||||
Accounts receivable, net | 18,887,000 | 22,540,000 | ||||||||||
Derivative contracts | 0 | 4,983,000 | ||||||||||
Total current assets | 25,609,000 | 35,435,000 | ||||||||||
Investment in royalty interests(2) | 1,325,942,000 | [2] | 1,325,942,000 | [2] | ||||||||
Less: accumulated depletion and impairment(3) | (258,186,000) | [3] | (186,095,000) | [3] | ||||||||
Investment in royalty interests, net | 1,067,756,000 | 1,139,847,000 | ||||||||||
Derivative contracts | 0 | 1,476,000 | ||||||||||
Total assets | 1,093,365,000 | 1,176,758,000 | ||||||||||
Accounts payable and accrued expenses | 2,318,000 | 3,393,000 | ||||||||||
Derivative contracts, current | 968,000 | 0 | ||||||||||
Total liabilities | $ 3,286,000 | $ 3,393,000 | ||||||||||
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