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Share-Based Compensation (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 19, 2021
Jan. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense     $ 1,300,000 $ 3,000,000.0 $ 1,100,000
2006 Performance Unit Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock to be issued with plan     0    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward          
Nonvested awards January 1,   26,468 26,468    
Awards granted (in units)     0    
Vested     (9,048)    
Nonvested awards December 31,     17,420 26,468  
2006 Performance Unit Plan [Member] | Performance Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     5 years    
2013 Director Incentive Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock to be issued with plan     0    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward          
Nonvested awards January 1,   4,611 4,611    
Awards granted (in units)     5,048    
Vested     (5,373)    
Nonvested awards December 31,     4,286 4,611  
2013 Director Incentive Agreement [Member] | Performance Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
2006 Performance Unit Plan and 2013 Director Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cash payments distributed related to awards previously granted and now payable   $ 2,000,000.0      
2020 Performance Unit Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock to be issued with plan     0    
2020 Performance Unit Plan [Member] | Performance Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Estimated payout % based on performance criteria     100.00%    
Fair Value of each nonvested award     $ 89.13    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward          
Nonvested awards January 1,   0 0    
Awards granted (in units)     9,822    
Vested     (2,666)    
Forfeited     (153)    
Nonvested awards December 31,     7,003 0  
2020 Performance Unit Plan [Member] | Performance Units [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards to be granted as percentage of target units     200.00%    
2020 Performance Unit Plan [Member] | Performance Units [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards to be granted as percentage of target units     0.00%    
2020 Performance Unit Plan [Member] | Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward          
Nonvested awards January 1,   0 0    
Awards granted (in units)     9,822    
Vested     (2,666)    
Forfeited     (153)    
Nonvested awards December 31,     7,003 0  
2021 Long Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward          
Awards granted (in units)     0    
2021 Long Term Incentive Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock to be issued with plan     500,000    
2021 Long Term Incentive Plan [Member] | Performance Units [Member] | Subsequent Event [Member]          
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward          
Awards granted (in units) 10,187        
2021 Long Term Incentive Plan [Member] | Restricted Stock Units [Member] | Subsequent Event [Member]          
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward          
Awards granted (in units) 16,267