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Severance Reserve (Details) - Employee Severance - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Reserve for severance and related payments    
Balance at beginning of period $ 1,251 $ 909
Charged to earnings 278 1,032
Payments (765) (910)
Balance at end of period $ 764 $ 1,031