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Stock-Based Compensation Narrative (Details) - 2007 Incentive Stock Plan - Restricted Stock - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares approved for grant, restricted shares (in shares)     52,714  
Non-cash stock based compensation $ 0.7 $ 1.3 $ 2.1 $ 2.4
Unearned compensation expense, restricted shares $ 2.6   $ 2.6  
Estimated forfeiture rate, restricted shares (as a percent) 5.00%   5.00%  
Employees and Service Providers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares approved for grant, restricted shares (in shares)     12,439  
Award vesting period (in years)     3 years  
Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares approved for grant, restricted shares (in shares)     40,275  
Award vesting period (in years)     1 year