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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities    
Net income $ 104,845 $ 74,551
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,599 10,693
Stock-based compensation 14,296 8,887
Deferred income taxes 8,260 (255)
Changes in operating assets and liabilities:    
Accounts receivable (23,512) (17,773)
Prepaid insurance (16,058) (6,866)
Other current assets (2,073) 4,351
Other assets (2,033) (1,957)
Accounts payable (4,074) (2,324)
Payroll taxes and other payroll deductions payable (16,472) (89,815)
Accrued worksite employee payroll expense 43,553 28,194
Accrued health insurance costs (14,777) (1,948)
Accrued workers’ compensation costs 2,133 9,926
Accrued corporate payroll, commissions and other accrued liabilities (22,878) (15,183)
Income taxes payable/receivable (12,381) 16,808
Total adjustments (32,417) (57,262)
Net cash provided by operating activities 72,428 17,289
Marketable securities:    
Purchases (60,609) (11,849)
Proceeds from dispositions 5,499 5,439
Proceeds from maturities 55,110 1,125
Property and equipment:    
Purchases (17,207) (14,025)
Net cash used in investing activities (17,207) (19,310)
Cash flows from financing activities:    
Purchase of treasury stock (38,796) (16,227)
Dividends paid 24,740 16,786
Borrowings under revolving line of credit 25,000 0
Other 3,763 1,110
Net cash used in financing activities (34,773) (31,903)
Net increase (decrease) in cash, cash equivalents and restricted cash 20,448 (33,924)
Cash, cash equivalents and restricted cash beginning of period 535,474 549,612
Cash, cash equivalents and restricted cash end of period 555,922 515,688
Supplemental Cash Flow Information [Abstract]    
Cash and cash equivalents 324,926 308,711
Restricted cash 43,268 41,827
Deposits workers compensation 187,728 165,150
ROU assets obtained in exchange for lease obligations $ 11,894 $ 0