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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |
December 31, 2017 | $ (53,842)
Other comprehensive income (loss) before reclassifications | (8,128)
Gains reclassified from accumulated other comprehensive income | 2,039
June 30, 2018 | (40,849)
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
December 31, 2017 | (36,470)
June 30, 2018 | (42,559)
Unrealized (Loss) Gain on Investments, Net of Tax |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
December 31, 2017 | (22)
Other comprehensive income (loss) before reclassifications | 150
June 30, 2018 | 128
Unrealized (Loss) Gain on Derivative Instruments, Net of Tax |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
December 31, 2017 | (5,219)
Other comprehensive income (loss) before reclassifications | 5,786
Gains reclassified from accumulated other comprehensive income | 2,039
June 30, 2018 | 2,606
Unrealized (Loss) Gain on Net Investment Hedge, Net of Tax |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
December 31, 2017 | (4,311)
Other comprehensive income (loss) before reclassifications | 2,263
June 30, 2018 | (2,048)
Cumulative Translation Adjustment |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
December 31, 2017 | (26,918)
Other comprehensive income (loss) before reclassifications | (16,327)
June 30, 2018 | $ (43,245)

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