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Accumulated Other Comprehensive Loss (Schedule of Amounts Reclassified From AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on dissolution	$ (1,027)	$ 1,257	$ (1,135)	$ 123
Reclassification from AOCI | Accumulated Net Gain (Loss) from Cash Flow Hedges | Currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on dissolution	$ 1,401	$ 0	$ 1,401	$ 0

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