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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues:        
Total revenues $ 246,950 $ 227,513 $ 698,598 $ 647,648
Cost of revenues:        
Total cost of revenues 186,715 168,279 550,025 515,720
Gross margin 60,235 59,234 148,573 131,928
Selling, general and administrative expenses 41,170 35,587 113,939 100,957
Depreciation and amortization 1,342 1,341 3,967 3,512
Income from operations 17,723 22,306 30,667 27,459
Other income (expense):        
Investment income, net 1,825 1,664 5,559 6,431
Interest expense (46) (366) (433) (907)
Other, net   (4) (4) 169
Other income, net 1,779 1,294 5,122 5,693
Income before income taxes 19,502 23,600 35,789 33,152
Provision for income taxes 4,573 5,089 8,324 6,538
Net income $ 14,929 $ 18,511 $ 27,465 $ 26,614
Basic income per common share $ 1.98 $ 2.42 $ 3.63 $ 3.51
Weighted average number of basic common shares outstanding 7,545 7,639 7,559 7,572
Diluted income per common share $ 1.96 $ 2.40 $ 3.59 $ 3.46
Weighted average number of diluted common shares outstanding 7,607 7,709 7,642 7,688
Professional Employer Service Fees [Member]        
Revenues:        
Total revenues $ 217,972 $ 199,082 $ 620,287 $ 573,162
Staffing Services [Member]        
Revenues:        
Total revenues 28,978 28,431 78,311 74,486
Direct Payroll Costs [Member]        
Cost of revenues:        
Total cost of revenues 21,870 21,452 58,818 56,325
Payroll Taxes and Benefits [Member]        
Cost of revenues:        
Total cost of revenues 115,012 100,142 349,514 313,275
Workers' Compensation [Member]        
Cost of revenues:        
Total cost of revenues $ 49,833 $ 46,685 $ 141,693 $ 146,120