ion expense was $8,924 and $4.672 for the years ended December 31, 2014 end 2013. respecerNy. 4. Asset retirement obligations and other liabilities Act Nay in asset fel remert obigations fa the years ended December 31, 2014 and 2013 Is as follows (ti thOutandt) As of December 31. 2014 2013 Balance at