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Operating Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease expense $ 31,292 $ 62,272
Variable lease expense (1) 2,179 4,254
Total operating lease expense $ 33,471 $ 66,526