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Unaudited Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Service [Member]  
Service revenue $ 235,306 $ 239,680
Operating expenses:    
Cost of services 137,762 141,282
Selling, general, and administrative expense 64,294 64,247
Depreciation 9,661 8,901
Amortization of intangible assets 5,124 4,711
Loss (gain) on disposal of assets 65 (15)
Total operating expenses 216,906 219,126
Operating income 18,400 20,554
Other expense (income) (2,177) 1,053
Financing expenses 5,099 1,602
Income before income taxes 15,478 17,899
Provision for income taxes 5,969 6,313
Net income $ 9,509 $ 11,586
Net income per common share:    
Basic (in usd per share) $ 0.10 $ 0.12
Diluted (in usd per share) $ 0.09 $ 0.11
Weighted-average number of common shares outstanding:    
Basic (in shares) 97,561,650 97,481,412
Diluted (in shares) 100,952,573 104,122,026