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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
December 31, 2017	$ (53,842)
Other comprehensive income (loss) before reclassifications	(7,653)
Gains reclassified from accumulated other comprehensive income	1,936
September 30, 2018	(1,363)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
December 31, 2017	(36,470)
September 30, 2018	(42,187)
Unrealized (Loss) Gain on Investments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
December 31, 2017	(22)
Other comprehensive income (loss) before reclassifications	187
September 30, 2018	165
Unrealized (Loss) Gain on Derivative Instruments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
December 31, 2017	(5,219)
Other comprehensive income (loss) before reclassifications	7,514
Gains reclassified from accumulated other comprehensive income	1,936
September 30, 2018	4,231
Unrealized (Loss) Gain on Net Investment Hedge, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
December 31, 2017	(4,311)
Other comprehensive income (loss) before reclassifications	2,818
September 30, 2018	(1,493)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
December 31, 2017	(26,918)
Other comprehensive income (loss) before reclassifications	(18,172)
September 30, 2018	$ (45,090)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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