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Share-Based Compensation (Summary of Restricted Share Activity) (Details) - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Restricted Stock Units (RSUs)    
Number of Shares    
Granted, Number of Shares (in shares)   4,600
Time-Based | Restricted Stock    
Number of Shares    
Outstanding - beginning of year, Number of Shares (in shares)   342,859
Granted, Number of Shares (in shares)   249,700
Vested, Number of Shares (in shares)   (164,778)
Canceled or expired, Number of Shares (in shares)   (7,834)
Outstanding - end of year, Outstanding - beginning of year, Number of Shares (in shares)   529,947
Weighted Average Grant Date Fair Value    
Outstanding - beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 34.71
Granted, Weighted Average Grant Date Fair Value (in dollars per share)   39.53
Vested, Weighted Average Grant Date Fair Value (in dollars per share)   39.99
Canceled or expired, Weighted Average Grant Date Fair Value (in dollars per share)   38.93
Outstanding - end of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 34.71
Time-Based | 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)   $ 38.10
Performance-Based | Restricted Stock    
Number of Shares    
Outstanding - beginning of year, Number of Shares (in shares)   165,000
Granted, Number of Shares (in shares)   0
Vested, Number of Shares (in shares) (55,000) (55,000)
Performance- to time-based, Number of Shares (in shares) (110,000)  
Canceled or expired, Number of Shares (in shares)   0
Outstanding - end of year, Outstanding - beginning of year, Number of Shares (in shares)   0
Weighted Average Grant Date Fair Value    
Outstanding - beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)   $ 38.10
Granted, Weighted Average Grant Date Fair Value (in dollars per share)   0.00
Vested, Weighted Average Grant Date Fair Value (in dollars per share)   38.10
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  
Performance-Based | 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)   $ 38.10