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Stock- Based Compensation (Details 4) (Performance stock units long term incentive plan 2010-2012 [Member])	12 Months Ended
	Dec. 31, 2011
Performance stock units long term incentive plan 2010-2012 [Member]
Performance based units earned under Long-Term Incentive Plans
Performance stock units outstanding at January 1, 2011	60,082
Performance stock units cancelled	(325)
Accrued dividend equivalents	1,693
Performance stock units outstanding at December 31, 2011	61,450

- Definition

Other than shares newly issued, the number of additional shares issued (for example, a stock split) or canceled (for example, to correct a share issuance), during the period under the plan.

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