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Equity - Schedule of SARs and Non-Vested Restricted Stock Outstanding (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, SARs (in shares) 116,417      
Exercisable, SARs (in shares) 66,602      
Vested or Expected to Vest, SARs (in shares) 116,417      
Outstanding, Non-vested Restricted Stock (in shares) 83,956 62,597 80,153 95,015
Expected to Vest, Non-vested Restricted Stock (in shares) 83,956      
$10.00 - $24.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, SARs (in shares) 9,000      
Outstanding, Weighted-Average Remaining Contractual Life 1 year 1 month 6 days      
Exercisable, SARs (in shares) 9,000      
Exercisable, Weighted-Average Remaining Contractual Life 1 year 1 month 6 days      
Vested or Expected to Vest, SARs (in shares) 9,000      
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life 1 year 1 month 6 days      
25.00 - 39.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, SARs (in shares) 40,537      
Outstanding, Weighted-Average Remaining Contractual Life 3 years 8 months 12 days      
Exercisable, SARs (in shares) 40,537      
Exercisable, Weighted-Average Remaining Contractual Life 3 years 8 months 12 days      
Vested or Expected to Vest, SARs (in shares) 40,537      
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life 3 years 8 months 12 days      
40.00 - 54.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, SARs (in shares) 0      
Outstanding, Weighted-Average Remaining Contractual Life 0 years      
Exercisable, SARs (in shares) 0      
Exercisable, Weighted-Average Remaining Contractual Life 0 years      
Vested or Expected to Vest, SARs (in shares) 0      
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life 0 years      
55.00 - 69.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, SARs (in shares) 6,619      
Outstanding, Weighted-Average Remaining Contractual Life 6 years 3 months 18 days      
Exercisable, SARs (in shares) 6,619      
Exercisable, Weighted-Average Remaining Contractual Life 6 years 3 months 18 days      
Vested or Expected to Vest, SARs (in shares) 6,619      
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life 6 years 3 months 18 days      
70.00 - 84.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, SARs (in shares) 54,303      
Outstanding, Weighted-Average Remaining Contractual Life 8 years 10 months 24 days      
Exercisable, SARs (in shares) 6,474      
Exercisable, Weighted-Average Remaining Contractual Life 8 years 3 months 18 days      
Vested or Expected to Vest, SARs (in shares) 54,303      
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life 8 years 10 months 24 days      
85.00 - 99.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, SARs (in shares) 5,958      
Outstanding, Weighted-Average Remaining Contractual Life 7 years 3 months 18 days      
Exercisable, SARs (in shares) 3,972      
Exercisable, Weighted-Average Remaining Contractual Life 7 years 3 months 18 days      
Vested or Expected to Vest, SARs (in shares) 5,958      
Vested or Expected to Vest, Weighted-Average Remaining Contractual Life 7 years 3 months 18 days      
$35.00 - $49.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, Non-vested Restricted Stock (in shares) 0      
Outstanding, Weighted-Average Remaining Contractual Life 0 years      
Expected to Vest, Non-vested Restricted Stock (in shares) 0      
Expected to Vest, Weighted-Average Remaining Contractual Life 0 years      
50.00 - 64.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, Non-vested Restricted Stock (in shares) 19,622      
Outstanding, Weighted-Average Remaining Contractual Life 2 years 2 months 12 days      
Expected to Vest, Non-vested Restricted Stock (in shares) 19,622      
Expected to Vest, Weighted-Average Remaining Contractual Life 2 years 2 months 12 days      
65.00 - 79.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, Non-vested Restricted Stock (in shares) 43,804      
Outstanding, Weighted-Average Remaining Contractual Life 1 year 4 months 24 days      
Expected to Vest, Non-vested Restricted Stock (in shares) 43,804      
Expected to Vest, Weighted-Average Remaining Contractual Life 1 year 4 months 24 days      
80.00 - 94.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Outstanding, Non-vested Restricted Stock (in shares) 20,530      
Outstanding, Weighted-Average Remaining Contractual Life 9 months 18 days      
Expected to Vest, Non-vested Restricted Stock (in shares) 20,530      
Expected to Vest, Weighted-Average Remaining Contractual Life 9 months 18 days