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Variable Interest Entities - Royalty Trusts - Assets and Liabilities Included in Consolidated Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 309,766 $ 207,681 $ 5,863 $ 7,861
Accounts receivable 445,506 206,336    
Derivative contracts 71,022 4,066    
Total current assets 1,142,885 441,840    
Derivative contracts 23,617 26,415    
Total assets 9,790,731 6,219,609    
Accounts payable and accrued expenses 766,544 506,784    
Total liabilities 5,928,276 3,670,659    
Royalty Trusts
        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 7,445 [1] 3,151 [1]    
Accounts receivable 28,596 18,357    
Derivative contracts 10,286 1,499    
Total current assets 46,327 23,007    
Investment in royalty interests 1,325,942 [2] 858,795 [2]    
Less: accumulated depletion (103,746) (24,404)    
Investment in royalty interests, net total 1,222,196 834,391    
Derivative contracts 7,660 5,668    
Total assets 1,276,183 863,066    
Accounts payable and accrued expenses 1,101 486    
Total liabilities $ 1,101 $ 486    
[1] Includes $3.0 million and $2.0 million held by the trustee at December 31, 2012 and 2011, respectively, as reserves for future general and administrative expenses.
[2] Investment in royalty interests is included in oil and natural gas properties in the accompanying consolidated balance sheets, and was determined by allocating the historical net book value of the Company’s full cost pool based on the fair value of each Royalty Trust’s royalty interests relative to the fair value of the Company’s full cost pool.