Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Compensation Expense) (Details)

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Stock-Based Compensation (Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of employee stock-based compensation expense      
Stock-based compensation expense $ 54,436 $ 40,245 $ 31,331
Tax effect on stock-based compensation expense (13,734) (10,093) (11,906)
Net effect on income $ 40,702 $ 30,152 $ 19,425