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Stock-Based Compensation (Restricted Shares) (Details) - Restricted Shares - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total intrinsic value of awards released in period $ 0.7 $ 1.7
Time-Based Vesting    
Number of Shares (in shares)    
Outstanding at January 1 30,734  
Awarded 17,500  
Released 334  
Forfeited 2,000  
June 30, 2016 45,900  
Weighted - Average Grant Date Fair Value (in dollars per share)    
Outstanding at January 1 $ 21.76  
Awarded 21.69  
Released 21.52  
Forfeited 21.92  
June 30, 2016 $ 21.73  
Performance-Based Vesting    
Number of Shares (in shares)    
Outstanding at January 1 158,763  
Awarded 35,500  
Released 41,028  
Forfeited 5,312  
June 30, 2016 147,923  
Weighted - Average Grant Date Fair Value (in dollars per share)    
Outstanding at January 1 $ 22.86  
Awarded 17.86  
Released 21.74  
Forfeited 23.24  
June 30, 2016 $ 21.96  
Performance-Based Vesting    
Number of Shares (in shares)    
Awarded 35,500