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Leases - Lease Cost and Other Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 2,834 $ 8,417
Variable lease payments 311 1,137
Cash paid for amounts included in the measurement of operating lease liabilities $ 835 $ 2,421