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Accumulated Other Comprehensive Income (Schedule Of AOCI) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance beginning of period | $ (9,233) | $ (53,842)
Other comprehensive income before reclassifications | 4,521 | (8,128)
Gains reclassified from accumulated other comprehensive income | (3,313) | 2,039
Balance end of period | 171,549 | (40,849)
Total |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance beginning of period | (41,791) | (36,470)
Balance end of period | (40,583) | (42,559)
Unrealized (Loss) Gain on Investments, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance beginning of period | (157) | (22)
Other comprehensive income before reclassifications | 362 | 150
Gains reclassified from accumulated other comprehensive income | 0 | 0
Balance end of period | 205 | 128
Unrealized Gain (Loss) on Derivative Instruments, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance beginning of period | 7,589 | (5,219)
Other comprehensive income before reclassifications | 1,978 | 5,786
Gains reclassified from accumulated other comprehensive income | (3,313) | 2,039
Balance end of period | 6,254 | 2,606
Unrealized (Loss) Gain on Net Investment Hedge, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance beginning of period | (394) | (4,311)
Other comprehensive income before reclassifications | 500 | 2,263
Gains reclassified from accumulated other comprehensive income | 0 | 0
Balance end of period | 106 | (2,048)
Cumulative Translation Adjustment |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance beginning of period | (48,829) | (26,918)
Other comprehensive income before reclassifications | 1,681 | (16,327)
Gains reclassified from accumulated other comprehensive income | 0 | 0
Balance end of period | $ (47,148) | $ (43,245)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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