( 1 ) includes principal as well as interest payments . the preceding table does not reflect transition tax payments totaling $ 507 million as a result of the 2017 tax act . in addition , the table does not reflect unrecognized tax benefits at year-end 2018 of $ 559 million . in addition to the purchase obligations noted in the preceding table , in the normal course of business we enter into purchase commitments to manage the daily operating needs of the hotels that we manage