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Leases - Other Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating cash flows used by leases $ 15,873 $ 30,544
Leased assets obtained in exchange for new operating lease liabilities $ 21,172 $ 25,760