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Stock Plans - Summary of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	955,446
Exercised (in shares) | shares	(160,617)
Forfeited (in shares) | shares	4,721
Outstanding, ending balance (in shares) | shares	790,108
Exercisable (in shares) | shares	692,773
Weighted Average Exercise Price (dollars per share)
Outstanding, beginning balance (dollars per share) | $ / shares	$ 42.75
Exercised (dollars per share) | $ / shares	38.31
Forfeited (dollars per share) | $ / shares	44.50
Outstanding, ending balance (dollars per share) | $ / shares	43.66
Exercisable (dollars per share) | $ / shares	$ 43.55

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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

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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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