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Commitments and Contingencies - Noncash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]    
Right-of-use assets obtained in exchange for operating lease liabilities $ 0 $ 14,030
Right-of-use assets obtained in exchange for finance lease liabilities $ 412 $ 18