Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Expense (Details)

v3.20.4
Share-Based Compensation - Expense (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-Based Compensation      
Share-based compensation expense $ 14,752 $ 13,658 $ 11,317
Income tax benefit realized $ 7,772 $ 6,285 $ 3,154
2015 Plan      
Share-Based Compensation      
Number of shares available 2.1    
2015 Plan | Maximum      
Share-Based Compensation      
Number of shares authorized 4.0