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Stock-Based Compensation (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock options [Member]
Stock Based Compensation (Textual) [Abstract]
Granted stock options	249,330	263,910	2,982,720	2,391,965
Weighted-average grant-date fair value	$ 4.12	$ 4.90	$ 3.79	$ 5.65
Common Shares [Member]
Stock Based Compensation (Textual) [Abstract]
Stock issuances under equity compensation plans	189,588	281,776	294,936	787,476

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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