Segment Information (Summary of Inter-Segment Eliminations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues, net	$ 771,392	$ 646,291	$ 1,463,133	$ 1,380,666
Corporate / Inter-segment Eliminations
Segment Reporting Information [Line Items]
Revenues, net	(5,900)	(7,323)	(9,295)	(9,669)
Corporate / Inter-segment Eliminations | Domestic Operations
Segment Reporting Information [Line Items]
Revenues, net	(6,256)	(6,196)	(6,926)	(7,557)
Corporate / Inter-segment Eliminations | International and Other
Segment Reporting Information [Line Items]
Revenues, net	$ 356	$ (1,127)	$ (2,369)	$ (2,112)