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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
plan
Jun. 30, 2012
Jun. 30, 2013
Stock Incentive Plan 2011
May 08, 2013
Subsequent Event
Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock compensation expense $ 1.4 $ 1.7 $ 3.2 $ 3.6    
Number of share-based compensation plans     5      
Number of shares available for grant         2,040,696  
Additional shares authorized for grant           1,543,000
Total number of shares authorized           6,043,000
Grants in period, weighted average grant date fair value (dollars per share)     $ 1.61