Stock-Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of stock options activity
Beginning outstanding balance	3,267,838	4,000,526	5,041,235
Granted	425,150	429,963	662,185
Exercised	(231,403)	(560,132)	(130,135)
Cancelled	(305,954)	(602,519)	(1,572,759)
Ending outstanding balance	3,155,631	3,267,838	4,000,526
Weighted Average Exercise Price, Beginning Balance	$ 6.61	$ 6.26	$ 7.99
Weighted Average Exercise Price, Grant	$ 6.10	$ 7.11	$ 5.37
Weighted Average Exercise Price, Exercised	$ 4.52	$ 4.09	$ 3.28
Weighted Average Exercise Price, Cancelled	$ 7.10	$ 6.99	$ 11.67
Weighted Average Exercise Price, Ending Balance	$ 6.65	$ 6.61	$ 6.26
Weighted average fair value of options granted	$ 3.35	$ 4.07	$ 3.11
Aggregate intrinsic value of options exercised	$ 443	$ 2,485	$ 308

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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