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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents $ 1,484,444 $ 2,207,841    
Cash Held by Blackstone Funds and Other 324,609 337,320    
Cash and Cash Equivalents and Cash Held by Blackstone Funds and Other $ 1,809,053 $ 2,545,161 $ 1,998,926 $ 3,936,489