Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Income tax benefit related to goodwill impairment charges			$ 12,400
Full Impairement Charges		$ 113,100
Remaining goodwill balance	$ 96,931				$ 96,931		$ 287,983
Impairment charge to intangible assets					15,700
Services
Segment Reporting Information [Line Items]
Intangible asset amortization expense	1,500			$ 2,900	5,200	$ 8,200
G E S U S
Segment Reporting Information [Line Items]
Goodwill impairment			41,900
GES EMEA
Segment Reporting Information [Line Items]
Goodwill impairment			29,000
Remaining goodwill balance							30,829
Pursuit Glacier Park Collection
Segment Reporting Information [Line Items]
Goodwill impairment			$ 1,800
Pursuit
Segment Reporting Information [Line Items]
Remaining goodwill balance	$ 96,931				$ 96,931		$ 101,878