XML 100 R79.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Stock Purchase Plan, Stock Options and Warrants - Options Outstanding (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise, lower (in dollars per share) $ 9.95
Range of exercise, upper (in dollars per share) $ 38.35
Number outstanding (in shares) | shares 3,623
Number exercisable (in shares) | shares 1,110
$9.95 - $13.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise, lower (in dollars per share) $ 9.95
Range of exercise, upper (in dollars per share) $ 13.75
Number outstanding (in shares) | shares 925
Weighted Average Remaining Contractual Life (in years) 2 years 2 months
Weighted average exercise price (in dollars per share) $ 12.65
Number exercisable (in shares) | shares 713
Weighted average exercise price (in dollars per share) $ 12.84
$16.05 - $21.98  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise, lower (in dollars per share) 13.77
Range of exercise, upper (in dollars per share) $ 17.27
Number outstanding (in shares) | shares 991
Weighted Average Remaining Contractual Life (in years) 4 years 4 months 16 days
Weighted average exercise price (in dollars per share) $ 16.18
Number exercisable (in shares) | shares 294
Weighted average exercise price (in dollars per share) $ 15.96
$22.00 - $34.4  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise, lower (in dollars per share) 18.80
Range of exercise, upper (in dollars per share) $ 22.00
Number outstanding (in shares) | shares 425
Weighted Average Remaining Contractual Life (in years) 5 years
Weighted average exercise price (in dollars per share) $ 20.14
Number exercisable (in shares) | shares 103
Weighted average exercise price (in dollars per share) $ 20.18
$38.35 - $38.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise, lower (in dollars per share) 28.20
Range of exercise, upper (in dollars per share) $ 38.35
Number outstanding (in shares) | shares 1,282
Weighted Average Remaining Contractual Life (in years) 6 years 3 months 17 days
Weighted average exercise price (in dollars per share) $ 29.33
Number exercisable (in shares) | shares 0
Weighted average exercise price (in dollars per share) $ 0.00