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Leases (Other Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finance Leases:    
ROU assets recorded under finance leases $ 27,624 $ 19,606
Accumulated depreciation associated with finance leases (9,463) (7,551)
Total finance leases ROU assets, net 18,161 12,055
Total finance leases liabilities 18,287 11,788
Operating Lease Costs:    
Fixed lease expense 57,050 57,450
Variable lease expense 7,299 6,492
Total operating lease expense 64,349 63,942
Finance Lease Costs:    
Depreciation of finance lease ROU assets 5,392 4,729
Interest on lease liabilities 646 352
Total finance lease expense $ 6,038 $ 5,081