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Income Taxes (Schedule Of Uncertain Tax Position Liability And Liability For Interest And Penalties On Uncertain Tax Positions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Beginning balance $ 3,390 $ 969 $ 1,437
Increases related to current year tax positions 143 86 103
Increases related to prior year tax positions 1,155 2,668 403
Decreases related to prior year tax positions (106) (40) (70)
Decreases related to settlements (66)
Decreases due to the lapsing of statutes of limitations (254) (227) (904)
Ending balance 4,328 3,390 969
Beginning Balance 208 210 366
Accrual of interest and penalties 169 92 50
Decreases related to prior year tax positions (62) (94) (206)
Ending Balance $ 315 $ 208 $ 210