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Shareholders' Equity (Details 4) (Restricted Stock Units (RSUs) [Member], USD $)
3 Months Ended
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]
 
Summary of Restricted Stock Unit activity  
Unvested, Number of Shares, Beginning Balance 236,513
Unvested, Weighted Average Grant-Date Fair Value, Beginning Balance $ 4.95
Vested, Number of Shares (33,926)
Vested, Weighted Average Grant-Date Fair Value $ 4.46
Forfeited, Number of Shares (2,298)
Forfeited, Weighted Average Grant-Date Fair Value $ 6.97
Unvested, Number of Shares, Ending Balance 200,289
Unvested, Weighted Average Grant-Date Fair Value, Ending Balance $ 5.29
Expected to vest, Number of Shares 184,234
Expected to vest, Weighted Average Grant-Date Fair Value $ 5.25