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Summary of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Stock Options Outstanding
Stock Options Outstanding, Beginning of year | shares	4,375,929
Stock Options Outstanding, Exercised | shares	(733,033)
Stock Options Outstanding, Cancelled | shares	(117,635)
Stock Options Outstanding, End of year | shares	3,525,261
Stock Options Outstanding, Exercisable and Vested | shares	2,056,168
Weighted-Average Exercise Price
Weighted-Average Exercise Price, beginning of year | $ / shares	$ 10.73
Weighted Average Exercise Price, Exercised | $ / shares	7.05
Weighted Average Exercise Price, Cancelled | $ / shares	12.15
Weighted-Average Exercise Price, end of year | $ / shares	11.44
Weighted-Average Exercise Price, Exercisable and Vested | $ / shares	$ 10.25

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Number of share options (or share units) exercised during the current period.

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