Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Exp) (Details)

v3.8.0.1
Stock-Based Compensation (Exp) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of employee stock-based compensation expense        
Stock-based compensation expense   $ 31,331 $ 33,276 $ 15,161
Tax effect on stock-based compensation expense   (11,906) (13,001) (7,678)
Net effect on income   $ 19,425 $ 20,275 $ 7,483
Statutory rate (as a percent) 35.00%