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Equity-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Performance shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 5.0  
Weighted average period (in years) 1 year 10 months 24 days  
Restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 1.5  
Weighted average period (in years) 1 year 9 months 18 days  
Total fair value of RSU awards vested $ 0.1  
2005 Stock Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized   1.6
2014 Stock Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized   1.0
2005 and 2015 Stock Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized 1.0