Segment Information (Schedule of Revenue by Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues, net	$ 780,275	$ 654,015	$ 646,291	$ 734,375	$ 785,204	$ 718,597	$ 772,299	$ 784,221	$ 2,814,956	$ 3,060,321	$ 2,971,929
North America [Member]
Segment Reporting Information [Line Items]
Revenues, net									2,267,754	2,511,686	2,389,624
Europe [Member]
Segment Reporting Information [Line Items]
Revenues, net									385,787	382,888	394,235
Other Geographic Locations [Member]
Segment Reporting Information [Line Items]
Revenues, net									$ 161,415	$ 165,747	$ 188,070