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Stock Incentive Plans - stock options outstanding (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower range (in dollars per share) $ 25.28
Range of Exercise Prices, upper range (in dollars per share) $ 25.76
Outstanding Number of Options (in shares) | shares 734
Outstanding Weighted Average Remaining Years of Contractual Life 1 year 6 months 21 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 25.63
Exercisable Number of Options (in shares) | shares 734
Exercisable Weighted Average Exercise Price (in dollars per share) $ 25.63
$25.28-$25.76 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Number of Options (in shares) | shares 734
Outstanding Weighted Average Remaining Years of Contractual Life 1 year 6 months 21 days
Outstanding Weighted Average Exercise Price (in dollars per share) $ 25.63
Exercisable Number of Options (in shares) | shares 734
Exercisable Weighted Average Exercise Price (in dollars per share) $ 25.63