. while the board of directors has approved the program , the timing of any purchases , the prices and the number of shares of common stock to be purchased will be determined by our management , at its discretion , and will depend upon market conditions and other factors . the share repurchase program may be extended , suspended or discontinued at any time . as of december 31 , 2016 , the october 2015 repurchase program had remaining authorized purchase capacity of $ 451.7 million