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Stock-Based Compensation (Details 1) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of restricted stock activity        
Shares awarded, shares       229,950  
Restricted Stock [Member]
       
Summary of restricted stock activity        
Beginning balance, Shares     1,122,296  
Beginning balance, Weighted average grant date fair value     $ 5.90  
Ending balance, shares 972,485   972,485  
Ending balance, Weighted average grant date fair value $ 6.24   $ 6.24  
Shares awarded, shares     229,950 154,750
Shares awarded, Weighted average grant date fair value     $ 7.04  
Performance share units converted to restricted stock awards     139,150  
Performance share units converted to restricted stock awards, Weighted average grant date fair value     $ 6.47  
Shares vested (14,025) (14,525) (466,255) (396,221)
Shares vested, Weighted average grant date fair value     $ 5.87  
Restricted stock awards cancellation (46,668) (17,100) (52,656) (22,425)
Shares cancelled, Weighted Average Grant Date Fair Value     $ 6.70