Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Expense) (Details)

v3.10.0.1
Stock-Based Compensation (Expense) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Summary of employee stock-based compensation expense        
Stock-based compensation expense $ 10,603,000 $ 8,048,000 $ 29,574,000 $ 23,451,000
Tax effect on stock-based compensation expense (2,682,000) (3,018,000) (7,482,000) (8,794,000)
Net effect on income $ 7,921,000 $ 5,030,000 $ 22,092,000 $ 14,657,000
Statutory rate (as a percent) 25.30% 37.50% 25.30% 37.50%
Tax effect on stock-based compensation expense after valuation allowance $ 0   $ 0