Segment Information - Reconciliation of Assets from Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of assets from segment
Total Assets	$ 1,137,322	$ 1,090,346
Depreciation expense	42,224	43,032	$ 43,713
Amortization	8,819	9,451	10,037
Total Depreciation and Amortization	51,043	52,483	53,750
Capital expenditures	76,089	67,170	57,936
Pursuit
Reconciliation of assets from segment
Depreciation expense	32,937	31,075	27,360
Amortization	4,907	5,021	5,108
Capital expenditures	62,339	56,775	54,325
spiro
Reconciliation of assets from segment
Depreciation expense	1,922	3,599	4,769
Amortization	258	242	509
Capital expenditures	3,309	2,923	578
GES Exhibitions
Reconciliation of assets from segment
Depreciation expense	7,280	8,315	11,550
Amortization	3,654	4,188	4,420
Capital expenditures	10,337	7,342	2,557
Corporate and other
Reconciliation of assets from segment
Depreciation expense	85	43	34
Capital expenditures	$ 104	$ 130	$ 476