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Stock Plans - Summary of Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	735,001
Exercised (in shares) | shares	(44,407)
Outstanding, ending balance (in shares) | shares	690,594
Exercisable (in shares) | shares	690,594
Weighted Average Exercise Price (dollars per share)
Outstanding, beginning balance (dollars per share) | $ / shares	$ 43.79
Exercised (dollars per share) | $ / shares	36.24
Outstanding, ending balance (dollars per share) | $ / shares	44.28
Exercisable (dollars per share) | $ / shares	$ 44.28

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

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