Segment Information - Reconciliation of Assets from Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of assets from segment
Total Assets	$ 1,090,346	$ 1,037,630
Depreciation expense	43,032	43,713	$ 46,467
Amortization	9,451	10,037	10,098
Total Depreciation and Amortization	52,483	53,750	56,565
Capital expenditures	67,170	57,936	53,567
Pursuit
Reconciliation of assets from segment
Depreciation expense	31,075	27,360	24,761
Amortization	5,021	5,108	3,633
Capital expenditures	56,775	54,325	43,177
Spiro [Member]
Reconciliation of assets from segment
Depreciation expense	3,599	4,769	6,975
Amortization	242	509	1,306
Capital expenditures	2,923	578	1,570
GES-Exhibitions [Member]
Reconciliation of assets from segment
Depreciation expense	8,315	11,550	14,634
Amortization	4,188	4,420	5,159
Capital expenditures	7,342	2,557	8,820
Corporate and other
Reconciliation of assets from segment
Depreciation expense	43	34	97
Capital expenditures	$ 130	$ 476	$ 0