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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 435,588 $ 181,253 $ 814,663 $ 309,766
Accounts receivable 127,387 330,077    
Derivative contracts 84,349 291,414    
Total current assets 674,088 831,918    
Investment in royalty interests 12,892,830 11,997,743 11,504,422  
Less: accumulated depletion and impairment (11,149,888) (6,359,149) (5,762,969)  
Net oil and natural gas properties capitalized costs 1,742,942 5,638,594 $ 5,741,453  
Accounts payable and accrued expenses 428,417 683,392    
Royalty Trusts        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 7,824 9,387    
Accounts receivable 4,457 17,660    
Derivative contracts 0 6,589    
Total current assets 12,281 33,636    
Investment in royalty interests 1,325,942 1,325,942    
Less: accumulated depletion and impairment (1,248,957) (284,094)    
Net oil and natural gas properties capitalized costs 76,985 1,041,848    
Total assets 89,266 1,075,484    
Accounts payable and accrued expenses 1,060 2,852    
Total liabilities $ 1,060 $ 2,852