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Equity Incentive Plan - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
May. 27, 2015
Dec. 08, 2014
Jun. 11, 2014
Jul. 26, 2013
Jan. 30, 2010
May. 29, 2009
Jan. 30, 2009
May. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares granted                 419,000 1,001,200  
Stock options granted                 1,090,000 2,502,600  
Allocated stock-based compensation expense                 $ 6.8 $ 2.8 $ 3.2
2014 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares granted                   1,001,200  
Stock options granted                   2,502,600  
Shares authorized under equity incentive plan               4,978,249      
Expected life   6 years 6 months                  
Risk free return   1.81% 1.92%                
Volatility   32.92% 33.83%                
Dividend rate   1.68% 1.83%                
2008 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized under equity incentive plan                 4,311,796    
Vesting period (years)                 5 years    
Beginning of vesting period (years)                 1 year    
Expected life       6 years 6 months 6 years 6 months 6 years 6 months 6 years 6 months        
Risk free return       1.39% 2.90% 2.88% 2.17%        
Volatility       35.33% 38.29% 38.39% 35.33%        
Dividend rate       1.98% 1.81% 1.50% 1.61%        
Method used to estimate fair value       Black-Scholes option pricing model Black-Scholes option pricing model Black-Scholes option pricing model Black-Scholes option pricing model        
Restricted Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted shares granted               419,000      
Expected future stock-based compensation expense                 $ 13.9    
Average period of expected future stock option expense                 3 years 9 months 18 days    
Restricted Stock | 2014 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized under equity incentive plan               1,422,357      
Shares available for issuance under equity incentive plan                 43,877    
Restricted Stock | 2008 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares available for issuance under equity incentive plan                 60,085    
Stock Options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock options granted               1,090,000      
Vesting period (years)               5 years   5 years  
Beginning of vesting period (years)               1 year   1 year  
Stock option expiration period (years)               10 years   10 years  
Expected life 6 years 6 months   6 years 6 months                
Risk free return 1.67%                    
Volatility 32.06%                    
Dividend rate 1.90%                    
Expected future stock-based compensation expense                 $ 10.2    
Average period of expected future stock option expense                 3 years 9 months 18 days    
Stock Options | 2014 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized under equity incentive plan               3,555,892      
Shares available for issuance under equity incentive plan                 54,332    
Stock Options | 2008 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock option expiration period (years)                 10 years    
Shares available for issuance under equity incentive plan                 151,445