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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Unaudited Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Variable Interest Entity        
Cash and cash equivalents $ 983,617 $ 181,253 $ 918,758 $ 814,663
Accounts receivable, net 237,720 330,077    
Derivative contracts 120,575 291,414    
Total current assets 1,377,835 831,918    
Investment in royalty interests 12,460,706 11,997,743    
Less: accumulated depletion and impairment (9,131,153) (6,359,149)    
Net oil and natural gas properties capitalized costs 3,329,553 5,638,594    
Accounts payable and accrued expenses 494,675 683,392    
Royalty Trusts        
Variable Interest Entity        
Cash and cash equivalents 9,062 9,387    
Accounts receivable, net 8,455 17,660    
Derivative contracts 0 6,589    
Total current assets 17,517 33,636    
Investment in royalty interests 1,325,942 1,325,942    
Less: accumulated depletion and impairment (808,890) (284,094)    
Net oil and natural gas properties capitalized costs 517,052 1,041,848    
Total assets 534,569 1,075,484    
Accounts payable and accrued expenses 185 2,852    
Total liabilities $ 185 $ 2,852