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Leases - Lease Cost and Other Lease Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease Costs    
Operating lease costs $ 564 $ 620
Variable lease costs 174 171
Short-term lease costs 18 15
Total lease cost 756 806
Cash paid for amounts included in the measurement of lease liabilities    
Operating lease cash flows - Fixed payments 546 611
Operating lease cash flows - Liability reduction 495 530
Right of use assets obtained during the period in exchange for operating lease liabilities $ 148 $ 128
Weighted average lease term (in years) 5 years 9 months 29 days 6 years 6 months 3 days
Weighted average discount rate (in percent) 2.80% 3.05%