XML 21 R70.htm IDEA: XBRL DOCUMENT v3.2.0.727
Asset Retirement Obligations - Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Asset Retirement Obligation, Roll Forward Analysis      
Asset retirement obligations at December 31, 2014 $ 54,402    
Liability incurred upon acquiring and drilling wells 860    
Liability settled or disposed in current period (369)    
Accretion 2,191    
Asset retirement obligations at June 30, 2015 $ 54,402 $ 57,084 $ 54,402
Less: current portion   0  
Asset retirement obligations   $ 57,084 $ 54,402