Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Expense (Details)

v3.10.0.1
Share-Based Compensation - Expense (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-Based Compensation        
Share-based compensation expense $ 2,995 $ 3,017 $ 5,397 $ 5,101
Income tax (expense) benefit realized from award vestings $ (19) $ 338 $ 2,595 $ 1,166
2015 Plan        
Share-Based Compensation        
Number of shares authorized 4.0   4.0  
Number of shares available 2.6   2.6