Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:
Total revenue		$ 79,400	$ 70,500	$ 144,300	$ 130,800
Cost of sales:
Cost of service	[1]	(20,500)	(17,800)	(35,500)	(34,600)
Cost of product sales	[1]	(8,400)	(4,600)	(15,100)	(7,100)
Selling, general and administrative expenses		(26,600)	(25,700)	(55,800)	(48,900)
Acquisition and integration related transaction expenses					(200)
Depreciation and amortization		(10,100)	(10,200)	(19,500)	(20,900)
Net operating income		13,800	12,200	18,400	19,100
Other expense
Interest expense, net		(7,300)	(5,900)	(13,600)	(12,400)
Gain on disposal of business					900
Other finance income		100	300	200	600
Total other expense, net		(7,200)	(5,600)	(13,400)	(10,900)
Net income before income taxes		6,600	6,600	5,000	8,200
Income tax (expense) benefit		(1,000)	(200)	(800)	(300)
Net income		5,600	6,400	4,200	7,900
Other comprehensive income:
Foreign currency translation (loss) gain		(2,700)	9,000	(5,600)	12,500
Reclassification of loss on hedging instrument to comprehensive income		100	200	300	400
Actuarial gains (losses) on pension plan		300	(800)	500	(700)
Other comprehensive (loss) income		(2,300)	8,400	(4,800)	12,200
Comprehensive income (loss)		$ 3,300	$ 14,800	$ (600)	$ 20,100
Net income per common share – basic		$ 0.20	$ 0.23	$ 0.15	$ 0.28
Net income per common share - diluted		$ 0.19	$ 0.22	$ 0.14	$ 0.27
Weighted average number of shares outstanding during the period – basic		28,186,725	28,426,248	28,081,041	28,431,576
Weighted average number of shares outstanding during the period – diluted		29,073,078	29,349,718	29,023,288	29,446,526
Stock-based compensation included in:
Selling, general and administrative expenses		$ (3,100)	$ (2,600)	$ (6,000)	$ (5,400)
Service [Member]
Revenue:
Total revenue		67,500	64,100	125,000	120,100
Product Sales [Member]
Revenue:
Total revenue		$ 11,900	$ 6,400	$ 19,300	$ 10,700

[1] Excluding depreciation and amortization