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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities    
Net income $ 62,092 $ 76,289
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,602 6,691
Stock-based compensation 6,552 6,040
Deferred income taxes 12,560 8,671
Changes in operating assets and liabilities:    
Accounts receivable (54,966) (20,674)
Prepaid insurance (35,107) (16,517)
Other current assets 3,068 (8,893)
Other assets 3,403 (809)
Accounts payable 1,675 (2,768)
Payroll taxes and other payroll deductions payable (9,003) 46,896
Accrued worksite employee payroll expense 34,905 33,883
Accrued health insurance costs 25,661 10,679
Accrued workers’ compensation costs 3,467 1,367
Accrued corporate payroll, commissions and other accrued liabilities (46,531) (23,656)
Income taxes payable/receivable 8,409 498
Total adjustments (38,305) 41,408
Net cash provided by operating activities 23,787 117,697
Marketable securities:    
Purchases (8,689) (35,538)
Proceeds from dispositions 0 5,499
Proceeds from maturities 24,000 37,360
Property and equipment:    
Purchases (15,625) (5,608)
Net cash provided by (used in) investing activities (314) 1,713
Cash flows from financing activities:    
Purchase of treasury stock (61,203) (29,037)
Dividends paid (15,557) (12,386)
Borrowings under revolving line of credit 100,000 0
Other (2,363) (1,085)
Net cash used in financing activities 25,603 (40,338)
Net increase in cash, cash equivalents and restricted cash 49,076 79,072
Cash, cash equivalents and restricted cash beginning of period 592,550 535,474
Cash, cash equivalents and restricted cash end of period 641,626 614,546
Supplemental Cash Flow Information [Abstract]    
Cash and cash equivalents 404,728  
Restricted cash 48,349  
Deposits workers compensation 188,549  
ROU assets obtained in exchange for lease obligations $ 6,787 $ 3,140