Income Taxes (Unrecorded Deferred Income Taxes On Undistributed Earnings Of Foreign Subsidiaries) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax benefit adjustments related to tax cuts and jobs act	$ 1,508	$ 1,508
Additional tax expense from foreign tax positions, related to tax and jobs act	3,298	3,298
Tax Act, cumulative foreign earnings	65,113	65,113
Foreign earnings repatriated			$ 30,200
Accrued foreign withholding taxes, unremitted earnings of foreign subsidiaries	1,220	1,220	$ 7,932
Undistributed earnings from foreign subsidiaries	$ 2,318	$ 2,318