v3.20.4

Stock incentive plans - Stock option awards (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Aggregate Intrinsic Value |  |  |  |  |
Cash proceeds from exercise of stock option |  |  | $ 708 | $ 470 | $ 9,979
Stock options |  |  |  |  |
Number of Options |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  | 235,000 |  |
Exercised (in shares) |  |  | (105,000) | (69,000) | (972,000)
Canceled/forfeited (in shares) |  |  | (21,000) |  |
Outstanding and exercisable at end of period (in shares) | 109,000 | 235,000 | 109,000 | 235,000 |
Weighted Average Exercise Price |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  | $ 7.67 |  |
Exercised (in dollars per share) |  |  | 6.71 |  |
Canceled/forfeited (in dollars per share) |  |  | 12.15 |  |
Outstanding and exercisable at end of period (in dollars per share) | $ 7.75 | $ 7.67 | $ 7.75 | $ 7.67 |
Weighted-Average Remaining Contract Life (years) |  |  |  |  |
Outstanding and exercisable at end of period | 1 year 9 months 18 days | 2 years 7 months 6 days |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding and exercisable at end of period | $ 559 | $ 870 | $ 559 | $ 870 |
Total intrinsic value of stock options exercised (in dollars) |  |  | $ 697 | $ 423 | $ 14,935

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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