Share based compensation arrangement by share based payment award equity instruments other than options performance stock units number.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options performance stock units settled.

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ Details

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 65

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240

+ Details

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Disclosure of Incentive Compensation Plan (Details 3)	6 Months Ended
Disclosure of Incentive Compensation Plan (Details 3)	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Performance stock units long term incentive plan 2007-2009 [Member]
Performance based units earned under Long-Term Incentive Plans
Performance stock units outstanding		0		559,951
Performance stock units settled		(559,951)
Performance stock units long term incentive plan 2008-2010 [Member]
Performance based units earned under Long-Term Incentive Plans
Performance stock units outstanding	0	293,998	480,858	290,860
Accrued dividend equivalents		3,138
Performance stock units settled	(480,858)
Performance stock units long term incentive plan 2010-2012 [Member]
Performance based units earned under Long-Term Incentive Plans
Performance stock units outstanding	60,684		60,082
Accrued dividend equivalents	602