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Stock Award Plans, Compensation Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock Award Plans [Abstract]        
Compensation cost $ 3,426 $ 3,321 $ 9,148 $ 8,652
Income tax benefit $ 1,320 $ 889 $ 2,592 $ 2,151