Segment Information (Revenues by geographic region) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues, net	$ 654,015	$ 718,597	$ 2,034,681	$ 2,275,117
United States
Segment Reporting Information [Line Items]
Revenues, net	497,677	579,913	1,646,065	1,847,491
Europe
Segment Reporting Information [Line Items]
Revenues, net	110,448	108,365	274,763	299,782
Other
Segment Reporting Information [Line Items]
Revenues, net	$ 45,890	$ 30,319	$ 113,853	$ 127,844