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Consolidated Income Statements - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue:      
Total revenue $ 1,416,971 $ 1,377,260 $ 1,318,641
Operating expenses:      
Selling, general and administrative expenses 464,599 417,523 382,389
Acquisition-related costs 30,197 6,014 777
Depreciation and amortization expenses 87,889 74,921 70,501
Gain on disposition of property, plant and equipment (1,436) (1,559) (1,107)
Foreign exchange loss 792 1,612 (2,937)
Total operating expenses 1,176,824 1,114,100 1,095,439
Operating income 240,147 263,160 223,202
Interest expense (36,993) (35,568) (41,277)
Change in fair value of derivatives (1,248)    
Other income, net 3,326 8,296 8,838
Income before income taxes 205,232 235,888 190,763
Income tax expense 53,378 65,530 41,623
Net income 151,854 170,358 149,140
Net income attributable to:      
Stockholders 151,868 170,095 149,039
Non-controlling interests (14) 263 101
Net income $ 151,854 $ 170,358 $ 149,140
Earnings per share attributable to stockholders:      
Basic $ 1.38 $ 1.56 $ 1.37
Diluted $ 1.36 $ 1.54 $ 1.36
Weighted average number of shares outstanding:      
Basic 110,315,782 109,054,493 108,519,739
Diluted 111,406,830 110,310,984 109,759,123
Service Revenues [Member]      
Revenue:      
Total revenue $ 917,759 $ 871,596 $ 804,024
Operating expenses:      
Direct expenses 146,862 157,296 164,977
Inventory Sales Revenue [Member]      
Revenue:      
Total revenue 499,212 505,664 514,617
Operating expenses:      
Direct expenses $ 447,921 $ 458,293 $ 480,839