Segment Information - Reconciliation of Assets from Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Depreciation	$ 10,802	$ 10,674	$ 21,808	$ 21,576
Amortization	2,405	2,659	4,678	4,934
Capital expenditures	19,069	15,392	31,639	24,763
Pursuit
Segment Reporting Information [Line Items]
Depreciation	7,866	6,546	15,648	13,003
Amortization	1,316	1,439	2,495	2,469
Capital expenditures	17,219	14,396	28,710	23,619
Spiro
Segment Reporting Information [Line Items]
Depreciation	852	1,032	1,781	2,529
Amortization	51	122	103	252
Capital expenditures	442	146	586	294
GES-Exhibitions
Segment Reporting Information [Line Items]
Depreciation	2,070	3,084	4,361	6,020
Amortization	1,038	1,098	2,080	2,213
Capital expenditures	1,383	702	2,248	702
Corporate And Other
Segment Reporting Information [Line Items]
Capital expenditures	25	148	95	148
Corporate
Segment Reporting Information [Line Items]
Depreciation	$ 14	$ 12	$ 18	$ 24

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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