XML 17 R46.htm IDEA: XBRL DOCUMENT v2.4.0.6
Acquisitions and Divestitures - Permian Properties Disposal - Revenue and Expense Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Disposal, Revenue and Expense Information [Line Items]    
Revenue $ 511,690 $ 381,635
Direct operating expenses 170,060 124,158
Permian Properties
    
Disposal, Revenue and Expense Information [Line Items]    
Revenue 68,027 [1] 161,765
Direct operating expenses $ 17,453 [1] $ 35,990
[1] Information for the three months ended March 31, 2013 is through February 26, 2013, the date of sale.