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Stock Plans - Summary of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	735,001
Granted (Note 19) (in shares) | shares	23,285
Exercised (in shares) | shares	(109,501)
Forfeited (in shares) | shares	(95)
Outstanding, ending balance (in shares) | shares	648,690
Exercisable (in shares) | shares	640,683
Weighted Average Exercise Price (dollars per share)
Outstanding, beginning balance (dollars per share) | $ / shares	$ 43.79
Granted (dollars per share) | $ / shares	43.54
Exercised (dollars per share) | $ / shares	38.96
Forfeited (dollars per share) | $ / shares	49.19
Outstanding, ending balance (dollars per share) | $ / shares	44.59
Exercisable (dollars per share) | $ / shares	$ 44.58

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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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Net number of share options (or share units) granted during the period.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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