Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost And Reserve [Line Items]
Beginning balance	$ 4,513
Restructuring charges	851	$ 688
Cash payments	(1,293)
Adjustment to liability	(116)
Ending balance	3,955
GES \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance	2,935
Restructuring charges	664
Cash payments	(808)
Adjustment to liability	(80)
Ending balance	2,711
GES \| Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance	1,339
Restructuring charges	(8)
Cash payments	(223)
Adjustment to liability	(46)
Ending balance	1,062
Other Restructuring \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance	239
Restructuring charges	195
Cash payments	(262)
Adjustment to liability	10
Ending balance	$ 182

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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-Publisher FASB
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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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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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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.

+ References

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