v3.10.0.1

Stock incentive plans - Stock option awards (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Number of Options
Outstanding at beginning of the period (in shares)	1,283
Exercised (in shares)	(871)
Canceled/forfeited (in shares)	(7)
Outstanding and exercisable at end of the period (in shares)	405	1,283
Weighted Average Exercise Price
Outstanding at beginning of the period (in dollars per share)	$ 9.58
Exercised (in dollars per share)	11.21
Canceled/forfeited (in dollars per share)	5.99
Outstanding and exercisable at end of the period (in dollars per share)	$ 6.14	$ 9.58
Weighted-Average Remaining Contract Life (years)
Outstanding	3 years 4 months 24 days	3 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding and exercisable at end of the period	$ 11,660	$ 16,573
Vesting in 12 months
Stock incentive plans
Vesting period	12 months
Vesting percentage	25.00%
Vesting monthly 12 months after grant date
Stock incentive plans
Vesting period	4 years
Vesting percentage	75.00%

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Number of options outstanding, including both vested and non-vested options.

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