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Equity - Schedule of SARs and Non-Vested Restricted Stock Outstanding (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
SARs outstanding (in shares) 98,836      
SARs exercisable (in shares) 72,696      
SARs vested or expected to best (in shares) 98,836      
Non-vested restricted stock, outstanding (in shares) 62,597 80,153 95,015 138,497
Non-vested restricted stock expected to vest (in shares) 62,597      
$10.00 - $24.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
SARs outstanding (in shares) 14,000      
SARs outstanding, weighted-average remaining contractual life (in years) 1 year 7 months 6 days      
SARs exercisable (in shares) 14,000      
SARs exercisable, weighted-average remaining contractual life (in years) 1 year 7 months 6 days      
SARs vested or expected to best (in shares) 14,000      
SARs vested or expected to vest, weighted-average remaining contractual life (in years) 1 year 7 months 6 days      
25.00 - 39.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
SARs outstanding (in shares) 51,449      
SARs outstanding, weighted-average remaining contractual life (in years) 4 years 8 months 12 days      
SARs exercisable (in shares) 51,449      
SARs exercisable, weighted-average remaining contractual life (in years) 4 years 8 months 12 days      
SARs vested or expected to best (in shares) 51,449      
SARs vested or expected to vest, weighted-average remaining contractual life (in years) 4 years 8 months 12 days      
40.00 - 54.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
SARs outstanding (in shares) 0      
SARs outstanding, weighted-average remaining contractual life (in years) 0 years      
SARs exercisable (in shares) 0      
SARs exercisable, weighted-average remaining contractual life (in years) 0 years      
SARs vested or expected to best (in shares) 0      
SARs vested or expected to vest, weighted-average remaining contractual life (in years) 0 years      
55.00 - 69.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
SARs outstanding (in shares) 6,619      
SARs outstanding, weighted-average remaining contractual life (in years) 7 years 3 months 18 days      
SARs exercisable (in shares) 3,873      
SARs exercisable, weighted-average remaining contractual life (in years) 7 years 3 months 18 days      
SARs vested or expected to best (in shares) 6,619      
SARs vested or expected to vest, weighted-average remaining contractual life (in years) 7 years 3 months 18 days      
70.00 - 84.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
SARs outstanding (in shares) 19,422      
SARs outstanding, weighted-average remaining contractual life (in years) 9 years 3 months 18 days      
SARs exercisable (in shares) 0      
SARs exercisable, weighted-average remaining contractual life (in years) 0 years      
SARs vested or expected to best (in shares) 19,422      
SARs vested or expected to vest, weighted-average remaining contractual life (in years) 9 years 3 months 18 days      
85.00 - 99.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
SARs outstanding (in shares) 7,346      
SARs outstanding, weighted-average remaining contractual life (in years) 8 years 3 months 18 days      
SARs exercisable (in shares) 3,374      
SARs exercisable, weighted-average remaining contractual life (in years) 8 years 3 months 18 days      
SARs vested or expected to best (in shares) 7,346      
SARs vested or expected to vest, weighted-average remaining contractual life (in years) 8 years 3 months 18 days      
$35.00 - $49.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Non-vested restricted stock, outstanding (in shares) 0      
Non-vested restricted stock, weighted-average remaining contractual life (in years) 0 years      
Non-vested restricted stock expected to vest (in shares) 0      
Non-vested restricted stock expected to vest, weighted-average remaining contractual life (in years) 0 years      
50.00 - 64.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Non-vested restricted stock, outstanding (in shares) 13,535      
Non-vested restricted stock, weighted-average remaining contractual life (in years) 3 months 18 days      
Non-vested restricted stock expected to vest (in shares) 13,535      
Non-vested restricted stock expected to vest, weighted-average remaining contractual life (in years) 3 months 18 days      
65.00 - 79.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Non-vested restricted stock, outstanding (in shares) 15,851      
Non-vested restricted stock, weighted-average remaining contractual life (in years) 1 year 10 months 24 days      
Non-vested restricted stock expected to vest (in shares) 15,851      
Non-vested restricted stock expected to vest, weighted-average remaining contractual life (in years) 1 year 10 months 24 days      
80.00 - 94.99        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Non-vested restricted stock, outstanding (in shares) 33,211      
Non-vested restricted stock, weighted-average remaining contractual life (in years) 1 year 4 months 24 days      
Non-vested restricted stock expected to vest (in shares) 33,211      
Non-vested restricted stock expected to vest, weighted-average remaining contractual life (in years) 1 year 4 months 24 days