Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory Federal rate	21.00%	21.00%
Increase (decrease) resulting from:
Change in valuation allowance - current period activity	(2.20%)	(4.50%)
Change in valuation allowance - reversal	0.00%	(13.60%)
Capital loss	0.00%	13.60%
Stock compensation	(2.00%)	(11.50%)
Compensation deduction limitation	1.50%	10.10%
State and local taxes, net	3.80%	4.50%
Foreign income inclusion	0.00%	3.10%
Meals & entertainment	0.60%	1.80%
Change in uncertain tax positions	4.60%	(1.00%)
Provision to return differences	(0.10%)	0.20%
Other items, net	0.10%	1.70%
Provision for income taxes	27.30%	25.40%

Effective Income Tax Rate Reconciliation, Capital Loss, Percent

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Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Reversal, Percent

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Effective Income Tax Rate Reconciliation, Compensation Deduction Limitation, Percent

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Effective Tax Rate Reconciliation Components [Abstract]

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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