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Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Activity in the company's plan
Outstanding at January 1, 2012, Number of Shares	49,907
Granted, Number of Shares	0
Exercised, Number of Shares	(17,757)
Forfeited, Number of Shares	0
Outstanding (vested and expected to vest) at December 31, 2012, Number of Shares	32,150
Exercisable, Number of Shares	32,150
Outstanding at January 1, 2012, Weighted Average Exercise Price per Share	$ 34.39
Granted, Weighted Average Exercise Price per Share	$ 0.00
Exercised, Weighted Average Exercise Price per Share	$ 22.55
Forfeited, Weighted Average Exercise Price per Share	$ 0.00
Outstanding (vested and expected to vest) at December 31, 2012, Weighted Average Exercise Price per Share	$ 40.93
Exercisable, Weighted Average Exercise Price per Share	$ 40.93
Outstanding (vested and expected to vest), Weighted Average Remaining Contractual Term	4 years 4 months 24 days
Outstanding (vested and expected to vest), Aggregate Intrinsic Value	$ 595
Exercisable, Weighted Average Remaining Contractual Term	4 years 4 months 24 days
Exercisable, Aggregate Intrinsic Value	$ 595

X

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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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