Restructuring and Other Related Charges (Summary of Restructuring and Other Related Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	$ 8,625	$ 5,966
Operating segments | Domestic Operations
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	2,427	1,482
Operating segments | International & Other
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	4,490	3,977
Corporate / Inter-segment Eliminations
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	$ 1,708	$ 507