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Commitments and Contingencies - Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands | 6 Months Ended
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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

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