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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Cash and Restricted Cash (Unaudited) (Parenthetical)
$ in Thousands
Mar. 31, 2021
USD ($)
Statement of Cash Flows [Abstract]  
Cash and cash equivalents $ 843,237
Restricted cash 326,768 [1]
Total cash and cash equivalents and restricted cash shown in our condensed consolidated statements of cash flows 1,170,005
Senior Unsecured Notes 6.75 Percent Due 2021  
Debt Instrument, Amount Redeemed $ 300,000
Coupon rate (percent) 6.75%
[1] As of March 31, 2022, restricted cash consists of proceeds from the sale of joint venture interests and proceeds from the sale of properties to joint ventures 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. Restricted cash also consists of amounts escrowed for real estate taxes, insurance and capital expenditures at certain of our mortgaged properties. Prior to the deconsolidation of the joint venture that owns a life science property located in Boston, Massachusetts, or our Boston life science property joint venture, restricted cash also consisted of cash held for the operations of this joint venture. As of March 31, 2021, restricted cash also included amounts we used to redeem all $300,000 of our then outstanding 6.75% senior notes due 2021 in June 2021, when these notes became redeemable with no prepayment premium.