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Stock-Based Compensation (Schedule of Qualified Stock Option Activity) (Details) (Qualified Stock Options, USD $)	6 Months Ended
	Jun. 30, 2012
Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of year, Shares	377,480
Granted, Shares	61,000
Exercised, Shares	(17,050)
Cancelled, Shares	(4,200)
Outstanding at June 30, 2012, Shares	417,230
Granted, Exercise Price	$ 32.76	[1]
Exercised, Exercise Price	$ 17.44	[1]
Cancelled, Exercise Price	$ 11.45	[1]
Outstanding at June 30, 2012, Exercise Price	$ 21.40	[1]
Exercisable at June 30, 2012, Shares	275,430
Excercisable at June 30, 2012, Exercise Price	$ 19.53	[1]
Available for grant at June 30, 2012, Shares	105,700
[1] Weighted Averages

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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- Definition

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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- Definition

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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