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Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Total notional value | $ 246,999 | $ 224,680
Derivative fair value | (122) | (406)
Singapore Dollar [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 44,299 | 73,455
Derivative fair value | (1,036) | 364
Euro [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 26,207 | 37,718
Derivative fair value | 342 | (122)
Japanese Yen [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 39,860 | 30,688
Derivative fair value | 578 | (89)
South Korean Won [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 22,964 | 15,888
Derivative fair value | 471 | (134)
British Pound Sterling [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 48,318 | 13,233
Derivative fair value | (114) | 80
Other Currencies [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 65,351 | 53,698
Derivative fair value | $ (363) | $ (505)

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