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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities      
Net income $ 135,413 $ 84,402 $ 65,991
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 22,842 18,182 16,644
Amortization of marketable securities 137 80 90
Stock-based compensation 20,425 24,345 16,643
Deferred income taxes (4,533) 9,742 2,951
Changes in operating assets and liabilities:      
Accounts receivable (66,642) (63,697) (69,619)
Prepaid insurance 2,371 4,259 (7,624)
Other current assets (730) (7,465) (2,391)
Other assets (2,005) (2,496) (1,465)
Accounts payable 4,175 2,258 (1,192)
Payroll taxes and other payroll deductions payable (42,081) 55,481 42,373
Accrued worksite employee payroll expense 62,577 52,188 53,297
Accrued health insurance costs 9,078 (285) 12,717
Accrued workers’ compensation costs 23,763 23,945 21,723
Accrued corporate payroll, commissions and other accrued liabilities 8,941 17,138 3,150
Income taxes payable/receivable 10,749 (4,875) (7,920)
Total adjustments 49,067 128,800 79,377
Net cash provided by operating activities 184,480 213,202 145,368
Marketable securities:      
Purchases (87,887) (1,752) (1,049)
Proceeds from maturities 12,625 1,561 1,715
Proceeds from dispositions 16,299 0 7,268
Property and equipment:      
Purchases (35,328) (33,337) (33,994)
Proceeds from dispositions 151 278 43
Net cash used in investing activities (94,140) (33,250) (26,017)
Cash flows from financing activities      
Purchase of treasury stock (113,327) (38,735) (31,669)
Repurchase of common stock 0 0 144,263
Dividends paid (33,408) (65,768) (20,599)
Borrowings under long-term debt agreement 40,000 0 124,400
Principal repayments 0 0 (20,000)
Proceeds from the exercise of stock options 0 0 598
Other 2,257 1,554 1,373
Net cash used in financing activities (104,478) (102,949) (90,160)
Net increase (decrease) in cash and cash equivalents (14,138) 77,003 29,191
Cash, cash equivalents and restricted cash beginning of year 549,612 472,609 443,418
Cash, cash equivalents and restricted cash at end of year 535,474 549,612 472,609
Supplemental disclosures of cash flow information      
Income taxes, net 40,730 40,872 44,148
Interest expense 4,668 3,213 2,396
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]      
Cash, cash equivalents and restricted cash beginning of year 549,612 472,609 443,418
Cash, cash equivalents and restricted cash at end of year $ 535,474 $ 549,612 $ 472,609