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Stock-Based Compensation (Details)
item in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
item
shares
Jun. 30, 2014
USD ($)
Stock-Based Compensation        
Stock-based compensation expense (in dollars) $ 1.9 $ 1.0 $ 3.1 $ 2.2
Accelerated compensation expenses   $ 1.1    
Stock award plans and stock-based compensation        
Number of remaining stock options grants containing an acceleration clause | item     0.0  
2000 Stock Plan        
Stock award plans and stock-based compensation        
Number of shares of common stock available for future grant | shares 0   0