Segment Information (Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 99,713	$ 86,666
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	55,577	38,199
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	10,584	11,234
GERMANY
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	10,242	10,410
ITALY
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	5,258	6,290
FRANCE
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	5,209	5,823
INDIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	3,949	4,235
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 8,894	$ 10,475