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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Variable Interest Entity        
Cash and cash equivalents $ 790,142 $ 181,253 $ 590,246 $ 814,663
Accounts receivable, net 198,205 330,077    
Derivative contracts 103,317 291,414    
Total current assets 1,108,997 831,918    
Investment in royalty interests 12,563,208 11,997,743    
Less: accumulated depletion and impairment (10,235,369) (6,359,149)    
Net oil and natural gas properties capitalized costs 2,327,839 5,638,594    
Accounts payable and accrued expenses 445,045 683,392    
Royalty Trusts        
Variable Interest Entity        
Cash and cash equivalents 7,702 9,387    
Accounts receivable, net 6,032 17,660    
Derivative contracts 0 6,589    
Total current assets 13,734 33,636    
Investment in royalty interests 1,325,942 1,325,942    
Less: accumulated depletion and impairment (1,051,186) (284,094)    
Net oil and natural gas properties capitalized costs 274,756 1,041,848    
Total assets 288,490 1,075,484    
Accounts payable and accrued expenses 952 2,852    
Total liabilities $ 952 $ 2,852