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Stock and Other Incentive Plans - 2015 Incentive Plan and related information (Details) - Stock Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of the activity under the incentive plans      
Share-based awards, beginning of year (shares) 1,769,863 1,907,645 1,786,497
Granted (shares) 276,839 273,012 413,489
Vested (shares) (292,636) (410,794) (292,341)
Share-based awards, end of year (shares) 1,754,066 1,769,863 1,907,645
Weighted-average grant date fair value of:      
Share-based awards, beginning of year (in USD per share) $ 29.36 $ 28.44 $ 27.18
Share-based awards granted during the year (in USD per share) 31.75 29.72 32.05
Share-based awards vested during the year (in USD per share) 28.84 25.32 25.88
Share-based awards, end of year (in USD per share) $ 29.82 $ 29.36 $ 28.44
Grant date fair value of shares granted during the year $ 8,791 $ 8,114 $ 13,254