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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.