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Stock Award Plans, Compensation Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Award Plans [Abstract]      
Compensation cost $ 13,612 $ 19,104 $ 11,460
Income tax benefit $ 3,368 $ 5,903 $ 4,333