Segment Information (Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 172,179	$ 189,672
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	90,136	117,784
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	52,843	41,852
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	11,510	11,330
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	8,319	8,535
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	3,130	3,271
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 6,241	$ 6,900