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Common Stock (Restricted Stock and Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock, Time-vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage by award type 100.00%    
Restricted Stock, Time-vesting | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period in years 3 years    
Restricted Stock, Performance-based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage by award type 0.00%    
Restricted Stock      
Shares      
Non-vested at beginning of period (in shares) 683,242    
Forfeited (in shares) (121,986)    
Granted to employees (in shares) 260,029    
Granted in service provider (in shares) 15,000    
Vested (in shares) (590,027)    
Non-vested at end of period (in shares) 246,258 683,242  
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Non-vested at beginning of period (in dollars per share) $ 15.92    
Forfeited (in dollars per share) 17.48    
Granted to employees (in dollars per share) 10.62 $ 11.92 $ 16.15
Granted to service provider (in dollars per share) 9.34    
Vested (in dollars per share) 14.63    
Non-vested at end of period (in dollars per share) $ 12.24 $ 15.92  
Fair value of vested restricted stock $ 8.6 $ 15.4 $ 13.7
Award unrecognized compensation expense $ 1.7    
Award unrecognized compensation expense, expected period for recognition 11 months 1 day    
Restricted Stock Units (RSUs)      
Shares      
Non-vested at beginning of period (in shares) 768,393    
Non-vested at end of period (in shares) 725,331 768,393  
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Non-vested at beginning of period (in dollars per share) $ 12.02    
Non-vested at end of period (in dollars per share) $ 16.41 $ 12.02  
Units to be converted (in shares) 252,405    
Award unrecognized compensation expense $ 8.5    
Award unrecognized compensation expense, expected period for recognition 1 year 8 months 23 days    
Awards granted (in shares) 604,682 768,393  
2016 | Restricted Stock Units (RSUs)      
Shares      
Forfeited (in shares) (263,585)    
Share equivalents not earned (in shares) (252,403)    
Vested (in shares) (252,405)    
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Forfeited (in dollars per share) $ 12.02    
Share equivalents not earned (in dollars per share) 12.02    
Vested (in dollars per share) $ 12.02    
2017 | Restricted Stock Units (RSUs)      
Shares      
Forfeited (in shares) (131,756)    
Granted to employees (in shares) 604,682    
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Forfeited (in dollars per share) $ 18.48    
Granted to employees (in dollars per share) $ 18.70