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Share-based Compensation (Summary of Performance-based Share Awards) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options and restricted stock (in shares) 116,000 156,000 161,000
Awards granted (in shares) 0 0  
Share-based payment arrangement, expense $ 9,903 $ 6,796 $ 4,520
Options And Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options and restricted stock (in shares) 75,000 111,000 143,000
Share-based payment arrangement, expense $ 4,302 $ 3,493 $ 3,817
Performance Shares | Granted In 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options and restricted stock (in shares) 15,000 0 0
Share-based payment arrangement, expense $ 1,986 $ 0 $ 0
Performance Shares | Granted In 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options and restricted stock (in shares) 26,000 28,000 0
Share-based payment arrangement, expense $ 1,807 $ 1,662 $ 0
Performance Shares | Granted In 2019      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options and restricted stock (in shares) 0 17,000 18,000
Share-based payment arrangement, expense $ 1,808 $ 1,641 $ 703