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Equity Plan - Unrecognized Compensation Cost - Nonvested Restricted Stock Awards (Details) - Restricted stock
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Unrecognized Compensation Cost  
Total unrecognized compensation cost related to nonvested restricted stock awards $ 3,153
Expected weighted-average period for recognition of compensation costs related to nonvested restricted stock awards 2 years 5 months 27 days