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Common Stock (Restricted Stock and Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock [Member]      
Shares      
Non-vested at beginning of period 826,518    
Granted 406,650    
Conversion of units 352,254    
Vested (653,211)    
Forfeited (32,995)    
Non-vested at end of period 899,216 826,518  
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Non-vested at beginning of period (in dollars per share) $ 18.78    
Granted (in dollars per share) 16.15 $ 27.29 $ 15.17
Conversion of units (in dollars per share) 24.66    
Vested (in dollars per share) 20.90    
Forfeited (in dollars per share) 22.72    
Non-vested at end of period (in dollars per share) $ 18.21 $ 18.78  
Fair value of vested restricted stock $ 13.7 $ 10.2 $ 8.4
Award unrecognized compensation expense $ 11.6    
Award unrecognized compensation expense, expected period for recognition 1 year 7 months 6 days    
Restricted Stock, Time-vesting [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage by award type 45.00%    
Restricted Stock, Time-vesting [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period in years 3 years    
Restricted Stock, Time-vesting [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period in years 4 years    
Restricted Stock, Performance-based [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage by award type 55.00%    
Restricted Stock Units [Member]      
Shares      
Non-vested at beginning of period 352,254    
Conversion of units (352,254)    
Share equivalents earned in 2015 386,049    
Non-vested at end of period 386,049 352,254  
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Non-vested at beginning of period (in dollars per share) $ 24.66    
Conversion of units (in dollars per share) 24.66    
Share equivalents earned in 2015 (in dollars per share) 21.96    
Non-vested at end of period (in dollars per share) $ 21.96 $ 24.66  
Award unrecognized compensation expense $ 5.7    
Award unrecognized compensation expense, expected period for recognition 2 years    
Awards granted 386,049    
Restricted Stock Units [Member] | Vesting on December 31, 2016 [Member]      
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Award vesting percentage 50.00%    
Restricted Stock Units [Member] | Vesting on December 31, 2017 [Member]      
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Award vesting percentage 50.00%