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Supplemental cash flow information (Schedule of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Supplemental cash flow information        
Cash and cash equivalents $ 362,612 $ 278,766    
Restricted cash 105,742 28,129    
Cash, cash equivalents, and restricted cash $ 468,354 $ 306,895 $ 590,299 $ 420,256