Annual report pursuant to Section 13 and 15(d)

Common Stock, Stock-Based Awards and Warrants - Stock Options by Exercise Price (Details)

v3.8.0.1
Common Stock, Stock-Based Awards and Warrants - Stock Options by Exercise Price (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]  
Number Outstanding (in shares) | shares 7,077
Weighted Average Remaining Contractual Term (in years) 2 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 8.76
Number Exercisable (in shares) | shares 4,794
Weighted Average Exercise Price (in dollars per share) $ 9.92
$16.70 - $16.70  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 21
Weighted Average Remaining Contractual Term (in years) 1 month 21 days
Weighted Average Exercise Price (in dollars per share) $ 16.70
Number Exercisable (in shares) | shares 21
Weighted Average Exercise Price (in dollars per share) $ 16.70
Exercise Price Range, Minimum (in dollars per share) 16.70
Exercise Price Range, Maximum (in dollars per share) $ 16.7
$13.26 - $16.06  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 183
Weighted Average Remaining Contractual Term (in years) 1 year 10 months 21 days
Weighted Average Exercise Price (in dollars per share) $ 14.30
Number Exercisable (in shares) | shares 139
Weighted Average Exercise Price (in dollars per share) $ 14.55
Exercise Price Range, Minimum (in dollars per share) 13.26
Exercise Price Range, Maximum (in dollars per share) $ 16.06
$12.51 - $13.15  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 1,015
Weighted Average Remaining Contractual Term (in years) 2 years 1 month 2 days
Weighted Average Exercise Price (in dollars per share) $ 12.95
Number Exercisable (in shares) | shares 780
Weighted Average Exercise Price (in dollars per share) $ 12.98
Exercise Price Range, Minimum (in dollars per share) 12.51
Exercise Price Range, Maximum (in dollars per share) $ 13.15
$10.57 - $11.43  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 808
Weighted Average Remaining Contractual Term (in years) 1 year 2 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 10.76
Number Exercisable (in shares) | shares 731
Weighted Average Exercise Price (in dollars per share) $ 10.76
Exercise Price Range, Minimum (in dollars per share) 10.57
Exercise Price Range, Maximum (in dollars per share) $ 11.43
$10.00 - $10.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 1,345
Weighted Average Remaining Contractual Term (in years) 3 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 10.00
Number Exercisable (in shares) | shares 1,345
Weighted Average Exercise Price (in dollars per share) $ 10.00
Exercise Price Range, Minimum (in dollars per share) 10.00
Exercise Price Range, Maximum (in dollars per share) $ 10.00
$9.31 - $9.79  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 425
Weighted Average Remaining Contractual Term (in years) 4 months 17 days
Weighted Average Exercise Price (in dollars per share) $ 9.62
Number Exercisable (in shares) | shares 425
Weighted Average Exercise Price (in dollars per share) $ 9.62
Exercise Price Range, Minimum (in dollars per share) 12.90
Exercise Price Range, Maximum (in dollars per share) $ 16.70
$6.34 - 9.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 1,021
Weighted Average Remaining Contractual Term (in years) 2 years 9 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 8.77
Number Exercisable (in shares) | shares 637
Weighted Average Exercise Price (in dollars per share) $ 8.73
Exercise Price Range, Minimum (in dollars per share) 10.57
Exercise Price Range, Maximum (in dollars per share) $ 12.51
$6.22 - $6.22  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 1,000
Weighted Average Remaining Contractual Term (in years) 3 years 8 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 6.22
Number Exercisable (in shares) | shares 530
Weighted Average Exercise Price (in dollars per share) $ 6.22
Exercise Price Range, Minimum (in dollars per share) 10.00
Exercise Price Range, Maximum (in dollars per share) $ 10.00
$6.18 - $6.18  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 144
Weighted Average Remaining Contractual Term (in years) 3 years 7 days
Weighted Average Exercise Price (in dollars per share) $ 6.18
Number Exercisable (in shares) | shares 67
Weighted Average Exercise Price (in dollars per share) $ 6.18
Exercise Price Range, Minimum (in dollars per share) 9.25
Exercise Price Range, Maximum (in dollars per share) $ 9.87
$3.21 - $3.21  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding (in shares) | shares 1,115
Weighted Average Remaining Contractual Term (in years) 6 years 7 months 10 days
Weighted Average Exercise Price (in dollars per share) $ 3.21
Number Exercisable (in shares) | shares 119
Weighted Average Exercise Price (in dollars per share) $ 3.21
Exercise Price Range, Minimum (in dollars per share) 6.18
Exercise Price Range, Maximum (in dollars per share) $ 9.21