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Common Stock (Outstanding Performance Share Awards) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance Shares Payout Level At 100%   100.00%    
Performance Shares Payout Level   71.00% 100.00% 32.00%
Share based compensation, outstanding at beginning of period, in shares   175,845    
Shares awards, number of shares awarded in period   49,826    
Performance shares award, number of shares vested in period   (46,831)    
Performance shares award, number of shares forfeited in period [1]   86,677    
Share based compensation, outstanding at end of period, in shares   75,846 175,845  
Shares outstanding, weighted average grant date fair value, beginning of period   $ 40.90    
Performance shares awards, weighted average grant date fair value   48.85 $ 48.99 $ 42.62
Performance shares award vested in period, weighted average grant fair value   38.78    
Performance shares forfeited, weighted average grant date fair value [1]   41.52    
Shares outstanding, weighted average grant date fair value, end of period   $ 47.33 $ 40.90  
Unrecognized compensation expense at end of period [2]   $ 302    
Aggregated intrinsic value for shares outstanding at end of period   $ 5,149    
Unrecognized compensation expense, period for recognition   1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Expirations   16,317    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price   $ 38.11    
Restricted Stock with a Performance Condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares award, number of shares forfeited in period 27,624      
[1] On August 1, 2019, the Company's former President and CEO forfeited the retention grant of 27,624 shares issued on December 15, 2015.
[2] The unrecognized compensation expense is expected to be recognized over the weighted average remaining contractual term of the awards of approximately one year. Under the Merger Agreement, performance shares that are unvested would be cancelled and converted into a vested right to receive cash upon the closing for the Merger.