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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 35,628 $ 32,693
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,254 4,271
Amortization of marketable securities 19 31
Stock-based compensation 4,503 3,575
Deferred income taxes 3,728 4,978
Changes in operating assets and liabilities:    
Restricted cash 179 (2,863)
Accounts receivable 6,149 (34,703)
Prepaid insurance (56) (4,137)
Other current assets (3,543) (11,313)
Other assets (7,641) (3,804)
Accounts payable 353 (168)
Payroll taxes and other payroll deductions payable 2,081 (3,038)
Accrued worksite employee payroll expense 1,974 105,739
Accrued health insurance costs (2,317) (5,906)
Accrued workers’ compensation costs 5,555 8,761
Accrued corporate payroll, commissions and other accrued liabilities (20,822) (9,465)
Income taxes payable/receivable 13,617 10,556
Total adjustments 8,033 62,514
Net cash provided by operating activities 43,661 95,207
Marketable securities:    
Purchases (711) (103)
Proceeds from dispositions 0 7,268
Proceeds from maturities 704 790
Property and equipment:    
Purchases (11,567) (4,880)
Net cash provided by (used in) investing activities (11,574) 3,075
Cash flows from financing activities:    
Purchase of treasury stock (9,317) (4,768)
Payments for Repurchase of Common Stock 0 (144,263)
Dividends paid (5,272) (4,652)
Borrowings under long-term debt agreement 0 124,400
Principal repayments 0 (20,000)
Other 318 311
Net cash used in financing activities (14,271) (48,972)
Net increase in cash and cash equivalents 17,816 49,310
Cash and cash equivalents at beginning of period 286,034 269,538
Cash and cash equivalents at end of period $ 303,850 $ 318,848