Segment Information (Long-Lived Assets by Geographic Region) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total long-lived assets	$ 127,842	$ 127,487
United States [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	94,476	93,845
Israel [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	12,728	13,940
Australia [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	9,184	9,496
Netherlands [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	8,051	7,495
Other [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	$ 3,403	$ 2,711