Restructuring and Other Related Charges (Summary of Restructuring and Other Related Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	$ 155	$ 3,507	$ 8,780	$ 9,473
Operating segments | Domestic Operations
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	216	1,204	2,643	2,686
Operating segments | International & Other
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	(17)	2,262	4,473	6,239
Corporate / Inter-segment eliminations
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related charges	$ (44)	$ 41	$ 1,664	$ 548