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Accounts Receivable - Summary of Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounts Receivable, Net, Current [Abstract]        
Oil and natural gas sales $ 215,450 $ 134,491    
Joint interest billing 202,405 49,688    
Oil and natural gas services 21,186 18,798    
Insurance receivable 4,590 0    
Production tax credits 2,265 3,331    
Related party 978 1,645    
Other 4,267 2,289    
Accounts receivable, gross 451,141 210,242    
Less: allowance for doubtful accounts (5,635) (3,906) (1,503) (3,590)
Total accounts receivable, net $ 445,506 $ 206,336