.0 million were written down to their net realizable value of $ 8888.8 million as a result of an asset impairment charge of $ 11.2 million . during the year ended december 31 , 2013 , certain long-lived assets held and used with a carrying value of $ 8554.5 million were written down to their net realizable value of $ 8538.6 million , as a result of an asset impairment charge of $ 15.9 million