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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating Lease, Cost $ 52,875 $ 52,317
Variable Lease, Cost 5,973 6,584
Short-term Lease, Cost 18,436 17,387
Lease, Cost, Total 77,284 76,288
Assets $ 9,152,074 $ 8,669,477