. we invested approximately $ 616 million , $ 415 million and $ 372 million in capital expenditures during 2016 , 2015 and 2014 , respectively . we expect to invest approximately 6%-7% ( 6%-7 % ) of 2017 revenue in capital expenditures . we used $ 0 million , $ 1720 million and $ 595 million of cash during 2016 , 2015 and 2014 , respectively , for acquisitions and other equity investments . see note 3 of the notes to consolidated financial statements for a discussion of the more significant items