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Share-Based Payments (Schedule of Stock Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Shares
Options granted	4,500
Options cancelled	(9,730)
Options exercised	(34,920)
Outstanding, ending balance	783,125
Options exercisable	463,295
Options available for future grants	717,025
Weighted Average Exercise Price
Outstanding, beginning balance	$ 13.2
Options granted	$ 17.07
Options cancelled	$ 15.37
Options exercised	$ 11.91
Outstanding, ending balance	$ 13.25
Options exercisable	$ 12.18

X

- Definition

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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

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