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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reconciliation of the basic and diluted earnings per share
Net income	$ 7,854	$ 1,115
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	125,436	119,182
Dilutive effect of stock options and unvested restricted stock	14,214	18,218
Weighted averages shares used in dilutive computation	139,650	137,400
Basic earnings per share	$ 0.06	$ 0.01
Dilutive earnings per share	$ 0.06	$ 0.01

X

- 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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