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Shareholders' Equity - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
shares
Mar. 31, 2021
shares
Jun. 30, 2020
USD ($)
shares
Mar. 31, 2020
shares
Jun. 30, 2021
vote
shares
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2020
shares
Equity Class Of Treasury Stock [Line Items]              
Common stock, shares issued (in shares) 9,689,421       9,689,421   9,681,728
Common stock, shares outstanding (in shares) 9,689,421       9,689,421   9,681,728
Common stock voting rights, number of votes per share | vote         1    
Common stocks              
Equity Class Of Treasury Stock [Line Items]              
Common stock, shares issued (in shares) 9,689,421       9,689,421   9,689,421
Common stock, shares outstanding (in shares) 9,681,728       9,681,728   9,681,728
Restricted Stock Units (RSUs)              
Equity Class Of Treasury Stock [Line Items]              
Shares repurchased (in shares) 2,307 0 2,308 0      
Shares repurchased | $ $ 7,000   $ 8,000        
Stock Repurchase Program, December 2018              
Equity Class Of Treasury Stock [Line Items]              
Shares repurchased (in shares) 0   1,698   0 2,398  
Shares repurchased | $     $ 6,000     $ 8,000