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Leases (Summary of Lease Costs and Other Lease Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease costs:        
Operating lease costs $ 795 $ 678 $ 1,475 $ 1,355
Variable lease costs [1] 90 101 188 202
Sublease income (12) (12) (23) (23)
Net lease costs $ 873 $ 767 1,640 1,534
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases     1,349 1,296
Right of use assets obtained in exchange for new operating lease liabilities     $ 4,178 $ 405
[1] Variable lease costs primarily represent variable payments such as common area maintenance, insurance, taxes and utilities.