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CONSOLIDATED STATEMENTS OF CASH FLOWS - Cash and Restricted Cash (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 634,848 $ 74,417 $ 37,357  
Restricted cash [1] 382,097 16,432 14,867  
Total cash and cash equivalents and restricted cash shown in our consolidated statements of cash flows $ 1,016,945 $ 90,849 $ 52,224 $ 70,071
[1] As of December 31, 2021, restricted cash consists of proceeds from the sale of an interest in the joint venture that owns a life science property located in Boston, Massachusetts held as collateral pursuant to the agreement governing our revolving credit facility, or our credit agreement. We may use these funds to pay for approved expenditures in accordance with our credit agreement. Effective as of the date of the sale, we deconsolidated this joint venture. Prior to the deconsolidation, restricted cash consisted primarily of cash held for the operations of this joint venture. Restricted cash also consists of amounts escrowed for real estate taxes, insurance and capital expenditures at certain of our mortgaged properties.