Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 16,038	$ 17,287
Interest and penalties on unrecognized benefits	1,361	1,224
Gross uncertain tax positions	17,399	18,511
Amount included in Current liabilities	2,648	3,866
Amount included in Other long-term liabilities	$ 14,751	$ 14,645