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Leases Leases Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Operating $ 462,767 $ 521,764
Finance 49,237 25,962
Total leased assets 512,004 547,726
Current    
Operating 44,631 42,039
Finance 5,430 2,314
Non-current    
Operating 474,507 516,979
Finance 47,209 25,788
Total lease liabilities $ 571,777 $ 587,120