Restructuring and Other Related Charges (Summary of Restructuring and Other Related Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	$ 754	$ 4,406	$ 9,534	$ 13,879
Operating segments | Domestic Operations
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	(135)	4,452	2,508	7,138
Operating segments | International & Other
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	800	0	5,273	6,239
Corporate / Inter-segment eliminations
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	$ 89	$ (46)	$ 1,753	$ 502