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Summary of Business Organization, Operations and Significant Accounting Policies - Stock Based Compensation (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Risk free interest rates 1.79% 2.44% 2.84%
Expected volatility 41.00% 41.00% 40.00%
Expected dividend rate 13.11% 8.47% 8.70%
Stock Options | Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expected term 4 years 4 years 4 years
Stock Options | Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expected term 5 years 5 years 5 years
Restricted Stock Award      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Risk free interest rates 0.85% 2.53% 2.58%
Expected volatility 30.30% 43.70% 44.50%
Beta 1.12 1.00 1.05