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Operating Leases - Components of Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Operating lease costs $ 1,756 $ 1,777 $ 3,516 $ 3,618
Short-term lease costs 415 535 852 1,014
Variable lease costs 544 508 1,037 1,022
Lease costs $ 2,715 $ 2,820 $ 5,405 $ 5,654