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Income Taxes - Reconciliation of Income Tax Rates (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
U.S. statutory federal rate 21.00% 21.00%
State and local rate, net of federal tax 4.54% 7.40%
Stock compensation (1.94%) (7.01%)
Excess compensation deduction (0.51%) (5.08%)
Foreign tax credits 0.11% 0.45%
Life insurance (0.04%) (0.81%)
Net operating loss carryback 0.56%  
Paycheck Protection Program addback 2.18%  
Other permanent differences (0.01%) (0.16%)
Income tax benefit 25.89% 15.79%