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Stock Option Plans and Share-Based Compensation - PSU Rollforward (Details) (Performance-Based Restricted Stock Units, USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Performance-Based Restricted Stock Units
   
Number of Shares:    
Nonvested, Beginning Balance 225,000  
Granted 135,000  
Vested (74,000)  
Forfeited (8,000)  
Nonvested, Ending Balance 278,000  
Weighted-Average Grant Date Fair Value Per Share (in dollars per share):    
Nonvested, Beginning Balance $ 13.32  
Granted   $ 16.49
Vested   $ 13.66
Forfeited   $ 10.93
Nonvested, Ending Balance   $ 14.72