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Stock-Based Compensation - Restricted Stock (Details) (Restricted Stock, USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total unrecognized compensation expense related to non-vested stock $ 2.2
Total compensation cost not yet recognized, period for recognition 1 year 4 months 24 days
Restricted Stock [Roll Forward]  
Nonvested as of December 31, 2013 (shares) 1,192,321
Granted (shares) 5,576
Grant Adjustments (shares) (4,925)
Vested (shares) (160,708)
Forfeited (shares) (16,135)
Nonvested as of March 31, 2014 (shares) 1,016,129
Weighted Average Grant Date Fair Value Per Share [Roll Forward]  
Nonvested as of December 31, 2013 (dollars per share) $ 4.87
Granted (dollars per share) $ 4.60
Grants Adjustments (dollars per share) $ 3.75
Vested (dollars per share) $ 3.85
Forfeited (dollars per share) $ 5.27
Nonvested as of March 31, 2014 (dollars per share) $ 5.02