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Leasing - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 1,173 $ 2,315
Variable lease cost 94 190
Short-term lease cost 1 1
Sublease income (9) (17)
Total lease cost $ 1,259 $ 2,489