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Stock and Other Incentive Plans - 2015 Incentive Plan and related information (Details) - Stock Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of the activity under the incentive plans      
Share-based awards, beginning of year (in shares) 1,766,061 1,754,066 1,769,863
Granted (in shares) 203,701 197,999 276,839
Vested (in shares) (404,777) (186,004) (292,636)
Forfeited (in shares) (2,957) 0 0
Share-based awards, end of year (in shares) 1,562,028 1,766,061 1,754,066
Weighted-average grant date fair value of:      
Share-based awards, beginning of year (in dollars per share) $ 30.51 $ 29.82 $ 29.36
Share-based awards granted during the year (in dollars per share) 30.86 30.33 31.75
Share-based awards vested during the year (in dollars per share) 28.38 23.82 28.84
Share-based awards forfeitures during the year (in dollars per share) 33.04 0 0
Share-based awards, end of year (in dollars per share) $ 31.10 $ 30.51 $ 29.82
Grant date fair value of shares granted during the year $ 6,286 $ 6,006 $ 8,791