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Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract]      
Operating cash outflow from finance leases $ 15,748 $ 19,115  
Financing cash outflow from finance leases 17,509 14,133 $ 12,952
Operating cash outflow from operating leases $ 2,648 1,812  
Right-of-use assets obtained in exchange for new operating lease liabilities   $ 2,225