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Shareholders' Equity and Stock Options (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Summary of changes in outstanding restricted common stock units    
Ending balance, Total Outstanding, Weighted Average Grant Date Fair Value per Unit $ 5.60  
Restricted Stock Units (RSUs) [Member]
    
Summary of changes in outstanding restricted common stock units    
Beginning balance, Total Outstanding, Units 1,135,840 1,106,166
Granted, Total Outstanding Units 460,178  
Forfeited, Total Outstanding Units (30,314)  
Distributed, Total Outstanding Units (142,093)  
Ending balance, Total Outstanding, Units 1,423,611 1,106,166
Beginning balance, Total Outstanding, Weighted Average Grant Date Fair Value per Unit $ 14.07  
Grant, Total Outstanding, Weighted Average Grant Date Fair Value per Unit $ 18.17  
Forfeited, Total Outstanding, Weighted Average Grant Date Fair Value per Unit $ 12.29  
Distributed, Total Outstanding, Weighted Average Grant Date Fair Value per Unit $ 9.15  
Ending balance, Total Outstanding, Weighted Average Grant Date Fair Value per Unit $ 15.93  
Beginning balance, Vested, Units 189,228  
Vested Units 264,272  
Distributed, Vested, Units (142,093)  
Ending balance, Vested, Units 311,407  
Beginning balance, Vested, Weighted Average Grant Date Fair Value per Unit $ 15.35  
Vested, Weighted Average Grant Date Fair Value per Unit $ 9.42  
Distributed, Vested, Weighted Average Grant Date Fair Value per Unit $ 9.15  
Ending balance, Vested, Weighted Average Grant Date Fair Value per Unit $ 13.15