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Summary of Significant Accounting Policies - Other Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accounting Policies [Abstract] |  |  |  |
Right-of-use assets obtained in exchange for new lease liabilities: Finance leases | $ 7,359 | $ 9,290 | $ 14,088 | $ 19,273
Right-of-use assets obtained in exchange for new lease liabilities: Operating leases | $ (8,172) | $ (1,541) | $ (35,397) | $ 9,170

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