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Stock-Based Compensation (Restricted Shares) (Details) - Restricted Shares - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total intrinsic value of awards released in period $ 3.2 $ 0.7
Time-Based Vesting    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 5,377  
Awarded 5,377  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.96  
Number of Shares (in shares)    
Outstanding at January 1 33,082  
Forfeited 0  
June 30, 2018 36,459  
Weighted - Average Grant Date Fair Value (in dollars per share)    
Outstanding at January 1 $ 22.85  
Forfeited 0.00  
June 30, 2018 $ 24.58  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 2,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 23.85  
Performance-Based Vesting    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 84,876  
Awarded 84,876  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 35.43  
Number of Shares (in shares)    
Outstanding at January 1 176,218  
Forfeited 1,235  
June 30, 2018 176,998  
Weighted - Average Grant Date Fair Value (in dollars per share)    
Outstanding at January 1 $ 25.50  
Forfeited 34.48  
June 30, 2018 $ 31.07  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 82,861  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 23.63  
Director [Member] | Time-Based Vesting    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 3,600