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Stock and Other Incentive Plans (Details) - Stock Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of the activity under the incentive plans      
Stock-based awards, beginning of year (shares) 1,907,645 1,786,497 1,092,262
Granted (shares) 273,012 413,489 885,219
Vested (shares) (410,794) (292,341) (190,984)
Stock-based awards, end of year (shares) 1,769,863 1,907,645 1,786,497
Weighted-average grant date fair value of:      
Stock-based awards, beginning of year (in USD per share) $ 28.44 $ 27.18 $ 24.72
Stock-based awards granted during the year (in USD per share) 29.72 32.05 29.60
Stock-based awards vested during the year (in USD per share) 25.32 25.88 24.34
Stock-based awards, end of year (in USD per share) $ 29.36 $ 28.44 $ 27.18
Grant date fair value of shares granted during the year $ 8,114 $ 13,254 $ 26,204