Segment Information (Summary of Inter-Segment Eliminations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues, net	$ 810,766	$ 654,015	$ 2,273,899	$ 2,034,681
Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	(1,920)	(4,248)	(11,215)	(13,917)
Corporate / Inter-segment Eliminations | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	(1,641)	(3,988)	(8,567)	(11,545)
Corporate / Inter-segment Eliminations | International and Other
Segment Reporting Information [Line Items]
Revenues, net	$ (279)	$ (260)	$ (2,648)	$ (2,372)