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Stock-Based Compensation (Summary of Restricted Share and Performance Share Activity) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Number of Shares [Roll Forward]      
Granted, number of shares   1,500  
Vested, number of shares   (1,500)  
Time-Based | Restricted Stock      
Number of Shares [Roll Forward]      
Outstanding - beginning of year, number of shares   208,429 208,429
Granted, number of shares     58,570
Vested, number of shares     (99,998)
Performance-based to time-based, number of shares     80,000
Canceled or expired, number of shares     (834)
Outstanding - end of year, number of shares 246,167   246,167
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)     40.16
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)     34.53
Outstanding - end of year, weighted average grant date fair value (in dollars per share) $ 37.71   $ 37.71
Vesting period 2 years    
Performance-Based | Restricted Stock      
Number of Shares [Roll Forward]      
Outstanding - beginning of year, number of shares   120,000 120,000
Granted, number of shares     165,000
Vested, number of shares (40,000)   (40,000)
Performance-based to time-based, number of shares 80,000   (80,000)
Canceled or expired, number of shares     0
Outstanding - end of year, number of 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