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Commitments and Contingencies - Noncash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]    
Right-of-use assets obtained in exchange for operating lease liabilities $ 2,376 $ 18,021
Right-of-use assets obtained in exchange for finance lease liabilities $ 444 $ 18