Income Taxes Reconciliation of statutory federal income tax rate to effective income tax rate (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes at federal statutory rate	21.00%	21.00%	35.00%
Effect of state and local income taxes, net of federal tax	3.70%	4.00%	3.10%
Tax accounting method change	0.00%	(2.50%)	0.00%
Changes in tax laws, including the Tax Act	0.20%	1.00%	18.30%
Deferred tax asset valuation allowance	(0.40%)	0.90%	(1.10%)
Tax contingencies	(0.10%)	0.10%	(1.00%)
Other	(0.30%)	(0.30%)	(1.90%)
Effective rate	24.10%	24.20%	52.40%

Effective Income Tax Rate Reconciliation, Tax Accounting Method Change, Percent

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

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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 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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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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