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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 38,079 $ 33,765 $ 48,292
Reconciliations of net income to net cash (used in) provided by operating activities:      
Depreciation and amortization 5,326 4,844 3,886
Non-cash operating lease expense 8,045 7,246 6,991
Investment amortization and losses recognized 1,433 587 1,117
Loss recognized on disposal of property and equipment 114 574  
Deferred income taxes (347) 5,492 2,656
Share-based compensation 5,366 3,436 7,173
Changes in certain operating assets and liabilities:      
Trade accounts receivable (37,201) 45,055 (11,964)
Income taxes 8,158 (5,150) (5,738)
Prepaid expenses and other (1,645) (1,042) (1,039)
Accounts payable (261) (1,247) 1,657
Accrued payroll, payroll taxes and related benefits 49,739 (22,608) 17,858
Other accrued liabilities 7,753 (1,671) (11,720)
Workers' compensation claims liabilities (77,640) (80,783) 25,477
Safety incentives liability (14,505) (9,123) (1,260)
Operating lease liabilities (7,886) (7,062) (6,242)
Other assets and liabilities, net 13 (228) (7)
Net cash (used in) provided by operating activities (15,459) (27,915) 77,137
Cash flows from investing activities:      
Purchase of property, equipment and software (6,801) (8,610) (10,798)
Purchase of investments (54,835) (65,738) (54,343)
Proceeds from sales and maturities of investments 75,256 47,922 88,771
Purchase of restricted investments (253,781) (34,968) (9,812)
Proceeds from sales and maturities of restricted investments 127,298 65,535 52,495
Net cash (used in) provided by investing activities (112,863) 4,141 66,313
Cash flows from financing activities:      
Proceeds from credit-line borrowings 2,718   18,843
Payments on credit-line borrowings (2,718)   (18,843)
Payments on long-term debt (221) (220) (221)
Repurchase of common stock (17,287) (8,056)  
Common stock repurchased on vesting of stock awards (1,465) (1,417) (3,136)
Dividends paid (9,069) (9,121) (8,208)
Proceeds from exercise of stock options 1,156 3,084 754
Net cash used in financing activities (26,886) (15,730) (10,811)
Net (decrease) increase in cash, cash equivalents and restricted cash (155,208) (39,504) 132,639
Cash, cash equivalents and restricted cash, beginning of period 233,837 273,341 140,702
Cash, cash equivalents and restricted cash, end of period $ 78,629 $ 233,837 $ 273,341