Segment Information (Revenue By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 321,497	$ 365,274
Long-lived assets	620,017		$ 664,949
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	214,734	273,211
Long-lived assets	447,308		489,189
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	106,763	$ 92,063
Long-lived assets	$ 172,709		$ 175,760