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Common Stock (Outstanding Performance Share Awards) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares Payout Level 100.00% 32.00% 0.00%
Share based compensation, outstanding at beginning of period, in shares [1] 172,591    
Shares awards, number of shares awarded in period 45,977    
Performance shares award, number of shares vested in period (39,077)    
Performance shares award, number of shares forfeited in period (3,646)    
Share based compensation, outstanding at end of period, in shares [1] 175,845 172,591  
Shares outstanding, weighted average grant date fair value, beginning of period [1] $ 38.21    
Performance shares awards, weighted average grant date fair value 48.99 $ 42.62 $ 38.11
Performance shares award vested in period, weighted average grant fair value 38.36    
Performance shares forfeited, weighted average grant date fair value 42.47    
Shares outstanding, weighted average grant date fair value, end of period [1] $ 40.90 $ 38.21  
Unrecognized compensation expense at end of period [1],[2] $ 1,961    
Aggregated intrinsic value for shares outstanding at end of period [1] $ 8,815    
Unrecognized compensation expense, period for recognition 1 year    
Restricted Stock with a Performance Condition      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares awards, number of shares awarded in period 27,624    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 5 years    
[1] On December 15, 2015, the Company issued a stock based retention grant to the President and CEO of 27,624 shares in accordance with the Amended and Restated 2007 LTIP that is eligible for vesting based on the achievement of certain performance conditions and a five year service period, as stated in the President and CEO's employment agreement. The performance condition was met as of November 2016 as determined by the Compensation Committee and has been included in the beginning and ending balance in the table above.
[2] The unrecognized compensation expense is expected to be recognized over the weighted average remaining contractual term of the awards of approximately one year, except for the President and CEO retention grant, which is approximately two years.