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Equity Incentive Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 23, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of restricted shares   $ 1.1 $ 1.1 $ 0.7
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation, other than options   $ 6.8    
Unrecognized compensation recognition period   3 years 3 months 18 days    
Vesting period   5 years    
Fair Value Inputs Forfeiture Rate   0.00%    
Shares Outstanding, Restricted stock granted   57,247 88,466 93,363
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation, other than options   $ 1.4    
Unrecognized compensation recognition period   4 years 2 months 12 days    
Performance period 3 years      
Vesting period 5 years      
Fair Value Inputs Forfeiture Rate   0.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 2 years 10 months 25 days      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 19.10%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 4.36%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.37%      
Share-based Compensation Arrangement by Share-based Payment Award, Amortization Expense, Term 5 years