Accumulated Other Comprehensive Income (Loss) (Schedule of Amounts Reclassified From AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other expense, net	$ 37	$ 3,548	$ 1,392
Reclassification from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other expense, net	$ 1,401	$ 0