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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Beginning balance				$ 2,251				$ 2,549	$ 2,251	$ 2,549	$ 3,782
Restructuring charges	$ 1,535	$ 1,702	$ 4,455	688	$ 588	$ 175	$ 662	162	8,380	1,587	1,004
Cash payments									(6,193)	(1,716)	(2,253)
Adjustment to liability									75	(169)	16
Ending balance	4,513				2,251				4,513	2,251	2,549
GES | Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance				2,039				1,551	2,039	1,551	2,274
Restructuring charges									6,071	1,457	442
Cash payments									(5,169)	(1,379)	(1,165)
Adjustment to liability									(6)	410
Ending balance	2,935				2,039				2,935	2,039	1,551
GES | Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance				200				807	200	807	1,092
Restructuring charges									1,817		265
Cash payments									(752)	(156)	(550)
Adjustment to liability									74	(451)
Ending balance	1,339				200				1,339	200	807
Other Restructuring | Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance				$ 12				$ 191	12	191	416
Restructuring charges									492	130	297
Cash payments									(272)	(181)	(538)
Adjustment to liability									7	(128)	16
Ending balance	$ 239				$ 12				$ 239	$ 12	$ 191

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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