Net Income per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of dilutive effect for awards with exercise price
Weighted average common shares outstanding, basic	40,511	38,568	40,108	37,451
Dilutive stock options, RSUs, MSUs, and the Warrant		590	1,317	680
Weighted average common shares outstanding, diluted	40,511	39,158	41,425	38,131
Antidilutive awards with exercise price less than average price [Member]
Summary of dilutive effect for awards with exercise price
Antidilutive securities excluded from computation of Earnings per share, Amount	26	1,145	246	788
Outstanding awards with exercise price greater than average price [Member]
Summary of dilutive effect for awards with exercise price
Antidilutive securities excluded from computation of Earnings per share, Amount	655	3,046	848	3,057
Outstanding awards with performance conditions not completed during the applicable period [Member]
Summary of dilutive effect for awards with exercise price
Antidilutive securities excluded from computation of Earnings per share, Amount	190		157
Outstanding Awards [Member]
Summary of dilutive effect for awards with exercise price
Antidilutive securities excluded from computation of Earnings per share, Amount	5,000