Segment Information (Long-Lived Assets by Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total long-lived assets	$ 145,509	$ 146,114
United States [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	109,517	109,006
Israel [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	18,173	18,982
Australia [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	8,132	8,500
Netherlands [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	7,709	7,686
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	$ 1,978	$ 1,940