Corporate Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State and local income taxes (net of federal tax benefit)	1.00%	2.00%	11.00%
Change in state effective income tax rate	0.00%	0.00%	3.00%
State tax (benefit) provision related to insurance premiums	0.00%	0.00%	(14.00%)
Tax reserves	0.00%	0.00%	1.00%
Permanent differences in fines and penalties	(3.00%)	0.00%	2.00%
Permanent difference in compensation	(2.00%)	(0.00%)	(0.00%)
Effective income tax rate reconciliation before valuation allowance	31.00%	37.00%	38.00%
Valuation allowance	151.00%	18.00%	(249.00%)
Effective income tax rate reconciliation	182.00%	55.00%	(211.00%)

Effective Income Tax Rate Reconciliation, Before Adjustment for Valuation Allowance and Federal Benefit of State

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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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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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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