Condensed Consolidated Income Statements - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue:
Total revenue	$ 484,546,000	$ 396,361,000	$ 878,467,000	$ 727,916,000
Operating expenses:
Selling, general and administrative expenses	144,277,000	109,560,000	270,883,000	223,799,000
Acquisition-related costs	3,399,000	3,049,000	13,036,000	5,971,000
Depreciation and amortization expenses	24,298,000	21,935,000	48,523,000	43,005,000
Foreign exchange loss (gain)	(158,000)	151,000	(322,000)	428,000
Total operating expenses	393,026,000	307,019,000	723,927,000	594,140,000
Gain on disposition of property, plant and equipment	(347,000)	(175,000)	(170,167,000)	(243,000)
Operating income	91,867,000	89,517,000	324,707,000	134,019,000
Interest expense	(18,463,000)	(8,867,000)	(39,149,000)	(17,813,000)
Change in fair value of derivatives, net			1,263,000
Other income, net	1,639,000	1,196,000	2,559,000	2,198,000
Income before income taxes	75,043,000	81,846,000	289,380,000	118,404,000
Income tax expense	21,632,000	21,065,000	57,868,000	29,484,000
Net income	53,411,000	60,781,000	231,512,000	88,920,000
Net income (loss) attributable to:
Stockholders	53,365,000	60,749,000	231,459,000	88,937,000
Non-controlling interests	46,000	32,000	53,000	(17,000)
Net income	$ 53,411,000	$ 60,781,000	$ 231,512,000	$ 88,920,000
Earnings per share attributable to stockholders:
Basic	$ 0.48	$ 0.55	$ 2.09	$ 0.81
Diluted	$ 0.48	$ 0.55	$ 2.07	$ 0.80
Weighted average number of shares outstanding:
Basic	110,760,339	110,311,615	110,705,182	110,144,229
Diluted	111,705,102	111,334,184	111,681,644	111,302,711
Service Revenues [Member]
Revenue:
Total revenue	$ 286,502,000	$ 252,748,000	$ 531,363,000	$ 458,778,000
Operating expenses:
Direct expenses	45,039,000	41,301,000	84,054,000	79,167,000
Inventory Sales Revenue [Member]
Revenue:
Total revenue	198,044,000	143,613,000	347,104,000	269,138,000
Operating expenses:
Direct expenses	$ 176,171,000	$ 131,023,000	$ 307,753,000	$ 241,770,000