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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of basic and diluted earnings per share
Net income	$ 4,533	$ 1,359	$ 5,777	$ 2,203
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	123,214	114,238	121,445	113,886
Dilutive effect of stock options and unvested restricted stock	15,244	21,837	16,433	21,729
Weighted-average common shares-diluted	138,458	136,075	137,878	135,615
Basic earnings per share	$ 0.04	$ 0.01	$ 0.05	$ 0.02
Dilutive earnings per share	$ 0.03	$ 0.01	$ 0.04	$ 0.02

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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