Earnings Per Share Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock Options [Member]
Statement [Line Items]
Outstanding stock options	2,100,000	1,600,000	2,100,000	1,600,000
Anti-dilutive stock options excluded from EPS calculation	300,000	1,100,000	300,000	700,000
Performance Vested Restricted Stock Units [Member]
Statement [Line Items]
Dilutive stock excluded from EPS calculation due to performance conditions not met	152,639	111,436	152,639	111,436