Income Taxes Reconciliation of Statutory Federal Income Tax Rate and Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income taxes statutory rate	21.00%	21.00%	21.00%	35.00%
Operating Loss Carryforwards		$ 75.7
Alternative minimum tax		126.0
Deferred Tax Assets, Tax Credit Carryforwards		$ 50.3
Increase (decrease) in rate as a result of:
State income taxes, net of federal income tax benefit	(1.60%)	(2.50%)	4.10%
State rate change(1)	8.00%	20.90%	(2.90%)
Valuation allowance (3)	3.30%	(18.00%)	(1.90%)
Permanent adjustments(3)	(7.20%)	(7.10%)	(0.10%)
Return to provision adjustment	1.10%	2.70%	(0.10%)
Uncertain tax provision(4)	0.00%	13.60%	0.00%
NOL rate re-measurements(5)	79.60%	0.00%	3.80%
Effective income tax rate	104.20%	30.60%	23.90%

Effective Income Tax Rate Reconciliation Penalties

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Effective Income Tax Rate Reconciliation Return To Provision Adjustment

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Effective Income Tax Reconciliation State Rate Change

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Effective Income Tax Reconciliation Valuation Allowance

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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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 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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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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