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Leases (Other Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Operating Leases:          
ROU assets recorded under operating leases $ 227,437   $ 227,437   $ 220,865
Accumulated amortization associated with operating leases (60,587)   (60,587)   (34,647)
Total operating leases ROU assets, net 166,850   166,850   186,218
Operating lease liabilities 34,634   34,634   36,108
Liabilities recorded under operating leases (non-current) 133,348   133,348   151,523
Total operating leases liabilities 167,982   167,982   187,631
Operating lease expense 14,114 $ 13,858 42,655 $ 43,864  
Variable lease expense 1,569 1,119 5,260 3,999  
Total operating lease expense 15,683 14,977 47,915 47,863  
Finance Leases:          
ROU assets recorded under finance leases 26,942   26,942   19,606
Accumulated depreciation associated with finance leases (8,443)   (8,443)   (7,551)
Total finance leases ROU assets, net 18,499   18,499   12,055
Total finance lease liabilities 18,540   18,540   $ 11,788
Amortization of finance lease ROU assets 1,448 993 4,051 3,280  
Interest on lease liabilities 181 102 472 253  
Total finance lease expense $ 1,629 $ 1,095 $ 4,523 $ 3,533