Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reportable segments reconciliations:
Total revenue		$ 358,163	$ 339,099	$ 999,268	$ 1,029,680
Segment operating income		52,809	43,931	76,037	92,213
Interest income		101	74	238	174
Interest expense		(2,608)	(2,117)	(7,031)	(6,281)
Other expense	[1]	(527)	(248)	(1,308)	(922)
Restructuring recoveries (charges)		(175)	(255)	(999)	(817)
Impairment recoveries				35	29,098
Income from continuing operations before income taxes		49,600	65,852	66,972	113,465
GES
Reportable segments reconciliations:
Total revenue		246,110		829,138
Pursuit
Reportable segments reconciliations:
Total revenue		112,053		170,130
Operating Segments
Reportable segments reconciliations:
Segment operating income		56,568	48,338	84,515	102,049
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		246,110	232,119	829,138	870,099
Segment operating income		1,160	(5,522)	30,745	48,526
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		112,053	106,980	170,130	159,581
Segment operating income		55,408	53,860	53,770	53,523
Restructuring recoveries (charges)				(140)
Impairment recoveries			24,467	35	29,098
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(2,479)	(6,682)	(12,173)	(17,126)
Intersegment Eliminations | Pursuit
Reportable segments reconciliations:
Total revenue		(554)		(1,260)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income	[2]	18	18	51	50
Corporate
Reportable segments reconciliations:
Segment operating income		(3,777)	(4,425)	(8,529)	(9,886)
Restructuring recoveries (charges)			(1)	10	(138)
Domestic Plans | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		191,699	184,761	636,806	684,003
Segment operating income		2,287	(2,664)	21,569	40,002
Restructuring recoveries (charges)		(162)	435	(402)	364
International | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		56,890	54,040	204,505	203,222
Segment operating income		(1,127)	(2,858)	9,176	8,524
Restructuring recoveries (charges)		$ (13)	$ (689)	$ (467)	$ (1,043)

[1] We adopted ASU 2017-07 on January 1, 2018, which requires retrospective adoption. As a result, we recorded the nonservice cost component of net periodic benefit cost within other expense for the three and nine months ended September 30, 2018, and we reclassified $0.2 million from operating expenses to other expense for the three months ended September 30, 2017 and $0.9 million for the nine months ended September 30, 2017 to conform with current period presentation. Refer to Note 1 – Overview and Basis of Presentation for additional details on the impact of this adoption on our Condensed Consolidated Statements of Operations.

[2] Corporate eliminations represent the elimination of depreciation expense recorded by Pursuit associated with previously eliminated intercompany profit realized by GES for renovations to Pursuit’s Banff Gondola.