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Stock-Based Compensation (Summary of Restricted Share and Performance Share Activity) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Number of Shares [Roll Forward]        
Granted, number of shares (in shares)     1,500  
Vested, number of shares (in shares)     (1,500)  
Time-Based | Restricted Stock        
Number of Shares [Roll Forward]        
Outstanding - beginning of year, number of shares (in shares)     208,429 208,429
Granted, number of shares (in shares)       58,570
Vested, number of shares (in shares)       (107,831)
Performance-based to time-based, number of shares (in shares)       80,000
Canceled or expired, number of shares (in shares)       (1,334)
Outstanding - end of year, number of shares (in shares) 237,834     237,834
Weighted Average Grant Date Fair Value [Abstract]        
Outstanding - beginning of year, weighted average grant date fair value (in dollars per share)     $ 36.61 $ 36.61
Granted, weighted average grant date fair value (in dollars per share)       30.72
Vested, weighted average grant date fair value (in dollars per share)       40.09
Converted, 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)       39.82
Outstanding - end of year, weighted average grant date fair value (in dollars per share) $ 37.63     $ 37.63
Vesting period 2 years      
Performance-Based | Restricted Stock        
Number of Shares [Roll Forward]        
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)
Performance-based to time-based, number of shares (in shares) 80,000     (80,000)
Canceled or expired, number of shares (in shares)       0
Outstanding - end of year, number of shares (in shares) 165,000     165,000
Weighted Average Grant Date Fair Value [Abstract]        
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
Converted, 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     $ 34.78