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Organization (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Number of operating segments | segment 2    
Cash and cash equivalents | $ $ 252,496 $ 319,002 $ 370,514