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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of the basic and diluted earnings per share
Net income/(loss)	$ 11,030	$ 3,092	$ (7,549)
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	122,138	114,132	111,981
Dilutive effect of stock options and unvested restricted stock	15,830	21,407
Weighted averages shares used in dilutive computation	137,968	135,539	111,981
Basic earnings/(loss) per share	$ 0.09	$ 0.03	$ (0.07)
Dilutive earnings/(loss) per share	$ 0.08	$ 0.02	$ (0.07)

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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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