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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal tax expense at statutory rate	34.00%	34.00%	34.00%
State income tax expense (net of federal income tax benefit)	4.00%	4.00%	5.00%
Permanent differences associated with general business credits	5.00%	(3.00%)	(1.00%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	(15.00%)	3.00%	1.00%
Other permanent differences	(2.00%)	7.00%	1.00%
Other	(1.00%)	1.00%	(3.00%)
Net income tax expense	25.00%	46.00%	37.00%

X

- Definition

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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