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Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Activity in the Company's Plan
Outstanding, Number of Share, January 1, 2012	49,907
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 34.39
Granted, Number of Shares	0
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Number of Shares	(9,111)
Exercised, Weighted Average Exercise Price	$ 19.26
Forfeited, Number of Shares	0
Forfeited, Weighted Average Exercise Price	$ 0.00
Outstanding (vested and expected to vest) at September 30, 2012	40,796
Weighted Average Exercise Price per Share, Outstanding	$ 37.77
Outstanding, Weighted Average Remaining Contractual Term	4 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value,	$ 675
Exercisable, Number of Shares	38,671
Exercisable, Weighted Average Exercise Price	$ 37.69
Exercisable, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Exercisable, Intrinsic Value	$ 643

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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