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Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives, Fair Value [Line Items] |  |
Total notional value | $ 224,680 | $ 328,221
Derivative fair value | (406) | (157)
Singapore Dollar [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 73,455 | 94,763
Derivative fair value | 364 | (2,611)
Euro [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 37,718 | 71,228
Derivative fair value | (122) | (1,441)
Japanese Yen [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 30,688 | 87,171
Derivative fair value | (89) | 4,180
South Korean Won [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 15,888 | 8,278
Derivative fair value | (134) | 407
British Pound Sterling [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 13,233 | 14,332
Derivative fair value | 80 | (660)
Other Currencies [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total notional value | 53,698 | 52,449
Derivative fair value | $ (505) | $ (32)

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