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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Net service revenues $ 240,495 $ 216,662 $ 704,070 $ 639,857
Cost of service revenues 165,310 149,616 483,100 442,804
Gross profit 75,185 67,046 220,970 197,053
General and administrative expenses 54,228 46,280 162,476 139,881
Depreciation and amortization 3,441 3,406 10,571 10,594
Total operating expenses 57,669 49,686 173,047 150,475
Operating income 17,516 17,360 47,923 46,578
Interest income (83) (37) (249) (90)
Interest expense 2,472 1,614 6,278 4,092
Total interest expense, net 2,389 1,577 6,029 4,002
Income before income taxes 15,127 15,783 41,894 42,576
Income tax expense 3,584 4,206 10,631 10,508
Net income $ 11,543 $ 11,577 $ 31,263 $ 32,068
Net income per common share        
Basic income per share $ 0.73 $ 0.74 $ 1.97 $ 2.04
Diluted income per share $ 0.71 $ 0.72 $ 1.94 $ 2.00
Weighted average number of common shares and potential common shares outstanding:        
Basic 15,872 15,748 15,846 15,727
Diluted 16,184 16,030 16,146 16,060