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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Beginning of year $ 4,211 $ 3,776 $ 1,342
Increase resulting from prior year tax positions 0 0 402
Increase resulting from current year tax positions 4,726 435 2,032
End of year $ 8,937 $ 4,211 $ 3,776