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Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Activity in the Company's Plan
Outstanding, Number of Share, January 1, 2012	49,907
Outstanding, Weighted Average Exercise Price, Ending Balance		$ 34.39
Granted, Number of Shares	0
Granted, Weighted Average Exercise Price	$ 0
Exercised, Number of Shares	(400)
Exercised, Weighted Average Exercise Price	$ 39.10
Forfeited, Number of Shares	0
Forfeited, Weighted Average Exercise Price	$ 0
Outstanding (vested and expected to vest) at June 30, 2012	49,507
Weighted Average Exercise Price per Share, Outstanding	$ 34.35
Outstanding, Weighted Average Remaining Contractual Term	4 years
Outstanding, Aggregate Intrinsic Value,	$ 1,166
Exercisable, Number of Shares	47,382
Exercisable, Weighted Average Exercise Price	$ 34.14
Exercisable, Weighted Average Remaining Contractual Term	3 years 10 months 24 days
Exercisable, Intrinsic Value	$ 1,126

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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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