Segment Information (Revenues by geographic region) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues, net	$ 691,741	$ 734,375
United States
Segment Reporting Information [Line Items]
Revenues, net	577,148	624,993
Europe
Segment Reporting Information [Line Items]
Revenues, net	82,036	72,479
Other
Segment Reporting Information [Line Items]
Revenues, net	$ 32,557	$ 36,903