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Leases (Summary of Lease Costs and Other Lease Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Lease costs:        
Operating lease costs $ 687 $ 663 $ 2,162 $ 2,018
Variable lease costs [1] 137 111 325 313
Sublease income 0 (12) (23) (35)
Net lease costs $ 824 $ 762 2,464 2,296
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases     2,008 1,947
Right of use assets obtained in exchange for new operating lease liabilities     $ 4,178 $ 470
[1] Variable lease costs primarily represent variable payments such as common area maintenance, insurance, taxes and utilities.