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Stock-Based Compensation (Summary of Restricted Share and Performance Share Activity) (Details) - Restricted Stock - $ / shares
3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Time-Based    
Number of Shares    
Outstanding - beginning of year, number of shares (in shares) 216,916 216,916
Granted, number of shares (in shares)   104,670
Vested, number of shares (in shares)   (89,404)
Performance-based to time-based, number of shares (in shares)   (110,000)
Canceled or expired, number of shares (in shares)   (2,000)
Outstanding - end of year, number of shares (in shares)   340,182
Weighted Average Grant Date Fair Value    
Outstanding - beginning of year, weighted average grant date fair value (in dollars per share) $ 36.94 $ 36.94
Granted, weighted average grant date fair value (in dollars per share)   38.41
Vested, weighted average grant date fair value (in dollars per share)   44.39
Converted, 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)   37.87
Outstanding - end of year, weighted average grant date fair value (in dollars per share)   $ 34.73
Performance-Based    
Number of Shares    
Outstanding - beginning of year, number of shares (in shares) 165,000 165,000
Granted, number of shares (in shares)   165,000
Vested, number of shares (in shares) (55,000) (55,000)
Performance-based to time-based, number of shares (in shares)   (110,000)
Canceled or expired, number of shares (in shares)   0
Outstanding - end 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 $ 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
Converted, 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
Vesting period   2 years