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Stock Option Plans - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options outstanding at the beginning of the year	1,267,802	1,357,813
Options granted	171,000	47,000
Options forfeited	(33,825)	(39,375)
Options exercised	(316,699)	(97,636)
Options outstanding at the end of the year	1,088,278	1,267,802
Options exercisable at the end of the year	769,403	970,017
Common stock available for future grants at the end of the year	66,850	201,350
Weighted average exercise price per share:
Granted	$ 21.41	$ 18.90
Forfeited	15.03	15.65
Exercised	10.99	12.79
Outstanding	14.18	12.46
Exercisable	$ 12.29	$ 11.72

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Gross number of share options (or share units) granted during the 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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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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