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Restructuring Charges - Changes to accrued liability balance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes to accrued liability balance related to restructuring
Charges incurred	$ 2,900	$ 0	$ 7,036	$ 0
Non-cash expense			(1,660)
Payments			(5,376)
Organizational Restructuring
Restructuring charges
Estimated additional charges	0		0
Changes to accrued liability balance related to restructuring
Charges incurred	(33)		1,695
Non-cash expense			(61)
Payments			(1,634)
Pandemic Restructuring
Changes to accrued liability balance related to restructuring
Charges incurred	1,435		3,843
Non-cash expense			(101)
Payments			(3,742)
Property Restructuring
Changes to accrued liability balance related to restructuring
Charges incurred	1,498		1,498
Non-cash expense			(1,498)
Loss on sale	915		915
Impairment loss	$ 583		$ 583