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Stock-Based Compensation (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other information      
Stock-based compensation expense recognized $ 3.5 $ 2.9 $ 2.1
Stock Option
      
Other information      
Total unrecognized stock-based compensation expense, net of estimated forfeitures 1.5    
Weighted average vesting period 1 year 7 months 6 days    
Restricted Stock
      
Other information      
Total unrecognized stock-based compensation expense, net of estimated forfeitures 3.4    
Weighted average vesting period 2 years 9 months 18 days    
Performance Awards
      
Other information      
Total unrecognized stock-based compensation expense, net of estimated forfeitures 1.1    
Weighted average vesting period 1 year 6 months    
LTIP
      
Other information      
Total unrecognized stock-based compensation expense, net of estimated forfeitures $ 6.0