Segment Information - Reconciliation of Income Statement Items from Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Reportable segments reconciliations:
Total revenue		$ 277,428	$ 325,807
Segment operating income (loss)		(13,016)	10,579
Interest income		84	58
Interest expense		(2,069)	(2,105)
Other expense	[1]	(238)	(452)
Restructuring recoveries (charges)		(162)	(394)
Impairment recoveries			2,384
Income (loss) from continuing operations before income taxes		(15,401)	10,070
Pursuit
Reportable segments reconciliations:
Total revenue		9,722
Operating Segments
Reportable segments reconciliations:
Segment operating income (loss)		(10,815)	13,104
Operating Segments | GES
Reportable segments reconciliations:
Total revenue		267,706	317,871
Segment operating income (loss)		580	23,379
Operating Segments | Pursuit
Reportable segments reconciliations:
Total revenue		9,722	7,936
Segment operating income (loss)		(11,395)	(10,275)
Restructuring recoveries (charges)		(140)
Impairment recoveries			2,384
Intersegment Eliminations | GES
Reportable segments reconciliations:
Total revenue		(3,348)	(3,239)
Corporate Eliminations
Reportable segments reconciliations:
Segment operating income (loss)	[2]	16	16
Corporate
Reportable segments reconciliations:
Segment operating income (loss)		(2,217)	(2,541)
Restructuring recoveries (charges)		10	(137)
U.S. | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		203,868	257,211
Segment operating income (loss)		(1,556)	21,346
Restructuring recoveries (charges)			(24)
International | Operating Segments | GES
Reportable segments reconciliations:
Total revenue		67,186	63,899
Segment operating income (loss)		2,136	2,033
Restructuring recoveries (charges)		$ (32)	$ (233)

[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 months ended March 31, 2018, and we reclassified $0.5 million from operating expenses to other expense for the three months ended March 31, 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.