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Share-Based Compensation (Summary of Restricted Share Activity) (Details) - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Restricted Stock    
Number of Shares    
Outstanding - beginning of year, Number of Shares (in shares)   216,916
Vested, Number of Shares (in shares)   (87,727)
Canceled or expired, Number of Shares (in shares)   (2,000)
Outstanding - end of year, Outstanding - beginning of year, Number of Shares (in shares)   342,859
Weighted Average Grant Date Fair Value    
Outstanding - beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 36.94
Vested, Weighted Average Grant Date Fair Value (in dollars per share)   44.78
Canceled or expired, Weighted Average Grant Date Fair Value (in dollars per share)   37.87
Outstanding - end of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 34.71
Restricted Stock and Restricted Stock Units    
Number of Shares    
Granted, Number of Shares (in shares)   105,670
Weighted Average Grant Date Fair Value    
Granted, Weighted Average Grant Date Fair Value (in dollars per share)   $ 38.48
Performance-Based    
Number of Shares    
Outstanding - beginning of year, Number of Shares (in shares)   165,000
Granted, Number of Shares (in shares)   165,000
Vested, Number of Shares (in shares) (55,000) (55,000)
Canceled or expired, Number of Shares (in shares)   0
Outstanding - end of year, Outstanding - beginning of year, Number of Shares (in shares)   165,000
Weighted Average Grant Date Fair Value    
Outstanding - beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 34.78
Granted, Weighted Average Grant Date Fair Value (in dollars per share)   38.10
Vested, Weighted Average Grant Date Fair Value (in dollars per share)   34.78
Canceled or expired, Weighted Average Grant Date Fair Value (in dollars per share)   0.00
Outstanding - end of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 38.10
Restricted shares and performance shares    
Number of Shares    
Performance- to time-based, Number of Shares (in shares)   110,000
Weighted Average Grant Date Fair Value    
Performance- to time-based, Weighted Average Grant Fair Value (in dollars per share)   $ 34.78
Time-Based    
Number of Shares    
Performance- to time-based, Number of Shares (in shares)   (110,000)
Weighted Average Grant Date Fair Value    
Performance- to time-based, Weighted Average Grant Fair Value (in dollars per share)   $ 34.78
Restricted Stock Units (RSUs)    
Number of Shares    
Granted, Number of Shares (in shares)   4,390
Share-based Compensation Award, Tranche One | Restricted Stock    
Weighted Average Grant Date Fair Value    
Vesting period 2 years  
Share-based Compensation Award, Tranche Two | Restricted Stock    
Number of Shares    
Performance- to time-based, Number of Shares (in shares) (110,000)