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Stock-Based Compensation Summary of stock option activity (Details) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at December 31, 2011	5,821
Options granted	1,678
Options exercised	(349)
Options forfeited	(934)
Options expired	(221)
Options outstanding at June 30, 2012	5,995

- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References+ Details

- Definition

Number of share options (or share units) exercised during the current period.

+ References+ Details