Segment Information (Revenues by geographic region) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues, net	$ 646,291	$ 772,299	$ 1,380,666	$ 1,556,520
United States
Segment Reporting Information [Line Items]
Revenues, net	523,395	605,114	1,148,388	1,267,578
Europe
Segment Reporting Information [Line Items]
Revenues, net	91,836	111,983	164,315	191,417
Other
Segment Reporting Information [Line Items]
Revenues, net	$ 31,060	$ 55,202	$ 67,963	$ 97,525