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Income Taxes (Reconciliation of Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate (percent)	34.00%	34.00%	34.00%
State taxes, net of federal benefit (percent)	1.20%	3.50%	3.50%
Tax credits (percent)	(0.10%)	(0.20%)	(1.10%)
Effect of foreign operations (percent)	1.10%	(2.20%)	0.10%
Stock compensation (percent)	(1.70%)	(2.90%)	0.00%
Permanent items and other (percent)	(1.60%)	(3.30%)	(1.70%)
Tax carryforwards not benefited (percent)	(45.70%)	(37.10%)	(34.40%)
Effective tax rate (percent)	(12.80%)	(8.20%)	0.40%

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 nondeductible expenses.

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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 attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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