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Accounts Receivable - Summary of Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts Receivable, Net, Current [Abstract]        
Oil, natural gas and NGL sales $ 166,157 $ 215,450    
Joint interest billing 168,596 202,405    
Oil and natural gas services 17,904 21,186    
Insurance receivable 2,500 4,590    
Related party 0 978    
Other 5,122 6,532    
Accounts receivable, gross 360,279 451,141    
Less: allowance for doubtful accounts (11,061) (5,635) (3,906) (1,503)
Total accounts receivable, net $ 349,218 $ 445,506