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Stock-Based Compensation (Details 5) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2012
Performance Units [Member]
Jun. 30, 2011
Performance Units [Member]
Summary of performance share activity          
Beginning balance, Shares       132,906  
Beginning balance, Weighted average grant date fair value       $ 6.48  
Shares awarded, shares       229,950 169,650  
Shares awarded, Weighted Average Grant Date Fair Value       $ 7.00  
Shares vested       (4,836) (30,037)
Shares vested, Weighted average grant date fair value       $ 6.75  
Performance share units converted to restricted stock awards       (139,150) 102,941
Performance share units converted to restricted stock awards, Weighted average grant date fair value       $ 6.47  
Shares cancelled, shares       (11,320) (35,083)
Shares cancelled, Weighted Average Grant Date Fair Value       $ 7.01  
Ending balance, shares       147,250  
Ending balance, Weighted average grant date fair value       $ 7.04