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Leases - Net Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 4,157 $ 8,280
Short term lease cost 0 9
Variable lease cost 833 1,536
Sublease income (156) (313)
Net lease cost $ 4,834 $ 9,512