Segment Information - Reconciliation of Assets from Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Depreciation	$ 10,480	$ 10,764	$ 32,288	$ 32,340
Amortization	2,476	2,712	7,154	7,646
Capital expenditures	23,131	20,424	54,770	45,187
Pursuit
Segment Reporting Information [Line Items]
Depreciation	7,501	6,734	23,149	19,737
Amortization	1,351	1,462	3,846	3,931
Capital expenditures	20,178	19,121	48,888	42,740
Spiro
Segment Reporting Information [Line Items]
Depreciation	912	1,158	2,693	3,687
Amortization	57	131	160	383
Capital expenditures	1,042	107	1,628	401
GES-Exhibitions
Segment Reporting Information [Line Items]
Depreciation	2,058	2,866	6,419	8,886
Amortization	1,898	1,059	4,146	1,761
Capital expenditures	1,068	1,119	3,148	3,332
Corporate And Other
Segment Reporting Information [Line Items]
Capital expenditures	13	137	108	285
Corporate
Segment Reporting Information [Line Items]
Depreciation	$ 9	$ 6	$ 27	$ 30

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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