v3.10.0.1

Stock incentive plans - Stock option awards (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Aggregate Intrinsic Value |  |  |
Cash proceeds from exercise of stock option | $ 9,979 | $ 9,244 | $ 2,984
Stock options |  |  |
Stock incentive plans |  |  |
Vesting period | 4 years |  |
Number of Options |  |  |
Outstanding at beginning of year (in shares) | 1,283,000 |  |
Exercised (in shares) | (972,000) | (1,776,000) | (532,000)
Canceled/forfeited (in shares) | (7,000) |  |
Outstanding and exercisable at end of year (in shares) | 304,000 | 1,283,000 |
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year (in dollars per share) | $ 9.58 |  |
Exercised (in dollars per share) | 10.26 |  |
Canceled/forfeited (in dollars per share) | 5.99 |  |
Outstanding and exercisable at end of year (in dollars per share) | $ 7.49 | $ 9.58 |
Weighted-Average Remaining Contract Life (years) |  |  |
Outstanding and exercisable at end of year | 3 years 9 months 18 days | 3 years 9 months 18 days |
Aggregate Intrinsic Value |  |  |
Outstanding and exercisable at end of year | $ 3,970 | $ 16,573 |
Total intrinsic value of stock options exercised (in dollars) | $ 14,935 | $ 20,551 | $ 1,675
Stock options | Vesting in 12 months |  |  |
Stock incentive plans |  |  |
Vesting period | 12 months |  |
Vesting percentage | 25.00% |  |
Stock options | Vesting monthly 12 months after grant date |  |  |
Stock incentive plans |  |  |
Vesting period | 4 years |  |
Vesting percentage | 75.00% |  |

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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=109197908&loc=d3e5070-113901 + Details
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