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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Net income $ 138,237 $ 151,099 $ 135,413
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 31,189 28,723 22,842
Amortization of marketable securities 783 (486) 137
Stock-based compensation 60,145 23,993 20,425
Deferred income taxes (5,647) 4,860 (4,533)
Changes in operating assets and liabilities:      
Accounts receivable 73,033 (65,156) (66,642)
Prepaid insurance 254 (2,007) 2,371
Other current assets 4,032 (15,772) (730)
Other assets and ROU assets 15,725 9,722 (2,005)
Accounts payable 1,638 (6,057) 4,175
Payroll taxes and other payroll deductions payable 100,712 16,082 (42,081)
Accrued worksite employee payroll expense (67,023) 71,880 62,577
Accrued health insurance costs 11,505 (13,973) 9,078
Accrued workers’ compensation costs (3,052) 13,247 23,763
Accrued corporate payroll, commissions and other accrued liabilities (20,763) (6,386) 8,941
Income taxes payable/receivable 5,585 (4,616) 10,749
Total adjustments 208,116 54,054 49,067
Net cash provided by operating activities 346,353 205,153 184,480
Marketable securities:      
Purchases (50,624) (110,131) (87,887)
Proceeds from maturities 49,635 108,380 12,625
Proceeds from dispositions 484 28,313 16,299
Property and equipment:      
Purchases (98,159) (56,307) (35,328)
Proceeds from dispositions 43 21 151
Net cash used in investing activities (98,621) (29,724) (94,140)
Cash flows from financing activities      
Purchase of treasury stock 99,415 203,043 113,327
Dividends paid (61,869) (48,622) (33,408)
Borrowings under long-term debt agreement 100,000 125,000 40,000
Other 7,701 8,312 2,257
Net cash used in financing activities (53,583) (118,353) (104,478)
Net increase (decrease) in cash and cash equivalents 194,149 57,076 (14,138)
Cash, cash equivalents and restricted cash beginning of year 592,550 535,474 549,612
Cash, cash equivalents and restricted cash at end of year 786,699 592,550 535,474
Supplemental disclosures of cash flow information      
Income taxes, net 51,097 38,299 40,730
Cash paid for interest 8,977 7,421 4,006
ROU assets obtained in exchange for lease obligations 22,770 24,474 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]      
Cash and cash equivalents 554,846 367,342 326,773
Restricted Cash and Cash Equivalents, Current 45,522 49,295 42,227
Deposits workers' compensation $ 186,331 $ 175,913 $ 166,474