Income Taxes (Summary Of The Activity Related To Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Unrecognized tax benefits – gross beginning balance	$ 11,022	$ 3,760	$ 2,160
Gross increases - prior period tax provisions	133	6,679	1,600
Gross increases – current period tax positions	325	583
Unrecognized tax benefits – gross ending balance	$ 11,480	$ 11,022	$ 3,760