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Share-Based Compensation (Summary of Restricted Share Activity) (Details) - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Number of Shares      
Granted, Number of Shares (in shares)   1,500  
Vested, Number of Shares (in shares)   (1,500)  
Restricted Stock      
Number of Shares      
Outstanding - beginning of year, Number of Shares (in shares)   208,429 208,429
Vested, Number of Shares (in shares)     (126,083)
Canceled or expired, Number of Shares (in shares)     (4,000)
Outstanding - end of year, Outstanding - beginning of year, Number of Shares (in shares)     216,916
Weighted Average Grant Date Fair Value      
Outstanding - beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 36.61 $ 36.61
Vested, Weighted Average Grant Date Fair Value (in dollars per share)     41.00
Canceled or expired, Weighted Average Grant Date Fair Value (in dollars per share)     36.34
Outstanding - end of year, Weighted Average Grant Date Fair Value (in dollars per share)     $ 36.94
Restricted Stock and Restricted Stock Units      
Number of Shares      
Granted, Number of Shares (in shares)     58,570
Weighted Average Grant Date Fair Value      
Granted, Weighted Average Grant Date Fair Value (in dollars per share)     $ 30.72
Performance-Based      
Number of Shares      
Outstanding - beginning of year, Number of Shares (in shares)   120,000 120,000
Granted, Number of Shares (in shares)     165,000
Vested, Number of Shares (in shares) (40,000)   (40,000)
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)   $ 48.72 $ 48.72
Granted, Weighted Average Grant Date Fair Value (in dollars per share)     34.78
Vested, Weighted Average Grant Date Fair Value (in dollars per share)     48.72
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)     $ 34.78
Restricted Stock Units (RSUs)      
Number of Shares      
Granted, Number of Shares (in shares)     6,020
Share-based Compensation Award, Tranche One [Member] | Restricted Stock      
Weighted Average Grant Date Fair Value      
Vesting period 2 years    
Share-based Compensation Award, Tranche One [Member] | Restricted shares and performance shares      
Number of Shares      
Performance- to time-based, Number of Shares (in shares)     80,000
Weighted Average Grant Date Fair Value      
Performance- to time-based, Weighted Average Grant Fair Value (in dollars per share)     $ 48.72
Share-based Compensation Award, Tranche Two [Member] | Restricted Stock      
Number of Shares      
Performance- to time-based, Number of Shares (in shares) (80,000)    
Share-based Compensation Award, Tranche Two [Member] | Time-Based      
Number of Shares      
Performance- to time-based, Number of Shares (in shares)     (80,000)
Weighted Average Grant Date Fair Value      
Performance- to time-based, Weighted Average Grant Fair Value (in dollars per share)     $ 48.72