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Retirement Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Retirement Benefit Plans [Abstract]      
Service cost $ 72 $ 71 $ 64
Interest cost 128 125 149
Recognition of net actuarial loss 28 38 28
Total recognized in the consolidated income statements 228 234 241
Recognition of net actuarial loss 60 79 174
Total recognized in other comprehensive income (pre-tax) 60 79 174
Total recognized in the consolidated income statements and other comprehensive income (pre-tax) $ 288 $ 313 $ 415