Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Expense (Details)

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Share-Based Compensation - Expense (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-Based Compensation      
Share-based compensation expense $ 13,658 $ 11,317 $ 9,889
Income tax benefit realized $ 6,285 $ 3,154 $ 2,882
2015 Plan      
Share-Based Compensation      
Number of shares available 2.3    
2015 Plan | Maximum      
Share-Based Compensation      
Number of shares authorized 4.0