Corporate Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State and local income taxes (net of federal tax benefit)	2.00%	11.00%	8.00%
Change in state effective income tax rate	0.00%	3.00%	(4.00%)
State tax (benefit) provision related to insurance premiums	0.00%	(14.00%)	7.00%
Tax reserves	0.00%	1.00%	1.00%
Permanent differences in fines and penalties	0.00%	2.00%	1.00%
Effective income tax rate reconciliation, before adjustment for valuation allowance and federal benefit of state	37.00%	38.00%	48.00%
Valuation allowance	18.00%	(249.00%)	(422.00%)
Elimination of federal effect of state deferred taxes	0.00%	0.00%	53.00%
Effective income tax rate reconciliation	55.00%	(211.00%)	(321.00%)

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

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Effective Income Tax Rate Reconciliation, Differences In Fines and Penalties, Percent

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Effective Income Tax Rate Reconciliation, Elimination of federal effect of state and deferred taxes

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Effect of State Tax Benefit Related To Insurance Premiums on effective tax rate.

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Effect of State Tax Valuation Allowance on effective tax rate.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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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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