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Related party transactions (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Chesapeake Holdings Corporation
Dec. 31, 2013
Chesapeake Holdings Corporation
Jun. 30, 2013
Properties Operated by Chesapeake
Jun. 30, 2013
Properties Operated by Chesapeake
Jun. 30, 2013
Properties Operated by Chaparral
Jun. 30, 2013
Properties Operated by Chaparral
Related Party Transactions            
Chaparral common stock owned by Chesapeake 20.00%          
Revenue from jointly owned properties     $ 1,460 $ 2,480 $ (956) $ (1,879)
Joint interest billings     (809) (1,312) 3,618 7,885
Amounts receivable from Chesapeake   466        
Amounts payable to Chesapeake   $ 64