Annual report pursuant to Section 13 and 15(d)

Compensation and Other Benefit Plans - Stock Option Activity (Details)

v3.10.0.1
Compensation and Other Benefit Plans - Stock Option Activity (Details) - Stock Options [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares, Outstanding at beginning of year | shares 1,622,065
Number of shares, Granted | shares 305,708
Number of shares, Exercised | shares (68,093)
Number of shares, Forfeited, expired or cancelled | shares (234,934)
Number of shares, Outstanding at end of year | shares 1,624,746
Number of shares, Exercisable at end of period | shares 1,102,036
Weighted Average Exercise Price Per Share, Outstanding at January 1, 2018 | $ / shares $ 24.54
Weighted Average Exercise Price Per Share, Granted | $ / shares 27.09
Weighted Average Exercise Price Per Share, Exercised | $ / shares 5.39
Weighted Average Exercise Price Per Share, Forfeited, expired or cancelled | $ / shares 43.46
Weighted Average Exercise Price Per Share, Outstanding at end of year | $ / shares 23.09
Weighted Average Exercise Price Per Share, Outstanding at December 31, 2018 | $ / shares $ 26.01
Weighted Average Contractual Term (in years), Outstanding at December 31, 2018 7 years 6 months
Weighted Average Contractual Term (in years), Exercisable at December 31, 2018 7 years
Aggregate Intrinsic Value, Outstanding at December 31, 2018 | $ $ 8,104
Aggregate Intrinsic Value, Exercisable at December 31, 2018 | $ $ 6,089