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Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 15,167	$ 14,480
Interest and penalties on unrecognized benefits	1,379	1,175
Gross uncertain tax positions	16,546	15,655
Amount included in Current liabilities	2,944	3,275
Amount included in Other long-term liabilities	$ 13,602	$ 12,380

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Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties

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Amount recognized for uncertainty in income taxes classified as current.

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-Topic 210
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Amount recognized for uncertainty in income taxes classified as noncurrent.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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