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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Lease costs:        
Operating lease costs $ 663 $ 706 $ 2,018 $ 2,096
Variable lease costs [1] 111 112 313 321
Sublease income (12) (12) (35) (35)
Net lease costs $ 762 $ 806 2,296 2,382
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases     1,947 1,332
Initial recognition of operating lease right of use assets       23,275
Initial recognition of operating lease liabilities       23,985
Right of use assets obtained in exchange for new operating lease liabilities     $ 470 $ 346
[1] Variable lease costs primarily represent variable payments such as common area maintenance, insurance, taxes and utilities.