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Stock Based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs)
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Shares  
Beginning Balance (in shares) | shares 180,925
Granted (in shares) | shares 0
Exercised (in shares) | shares 0
Forfeited (in shares) | shares (3,909)
Ending Balance (in shares) | shares 177,016
Exercisable at the end of period (in shares) | shares 124,801
Weighted Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 2.57
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 2.57
Ending balance (in dollars per share) | $ / shares 2.57
Exercisable at the period end (in dollars per share) | $ / shares $ 2.57