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CONSOLIDATED STATEMENTS OF CASH FLOWS
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Cash flows from operating activities      
Net income $ 151,099 $ 135,413 $ 84,402
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 28,723 22,842 18,182
Amortization of marketable securities (486) 137 80
Stock-based compensation 23,993 20,425 24,345
Deferred income taxes 4,860 (4,533) 9,742
Changes in operating assets and liabilities:      
Accounts receivable (65,156) (66,642) (63,697)
Prepaid insurance (2,007) 2,371 4,259
Other current assets (15,772) (730) (7,465)
Other assets (3,023) (2,005) (2,496)
Accounts payable (6,057) 4,175 2,258
Payroll taxes and other payroll deductions payable 16,082 (42,081) 55,481
Increase (Decrease) in WSEE payroll expense 71,880 62,577 52,188
Accrued worksite employee payroll expense 6,359 8,941 17,138
Accrued health insurance costs (13,973) 9,078 (285)
Accrued workers’ compensation costs 13,247 23,763 23,945
Income taxes payable/receivable (4,616) 10,749 (4,875)
Total adjustments 54,054 49,067 128,800
Net cash provided by operating activities 205,153 184,480 213,202
Marketable securities:      
Purchases (110,131) (87,887) (1,752)
Proceeds from maturities 108,380 12,625 1,561
Proceeds from dispositions 28,313 16,299 0
Property and equipment:      
Purchases (56,307) (35,328) (33,337)
Proceeds from dispositions 21 151 278
Net cash used in investing activities (29,724) (94,140) (33,250)
Cash flows from financing activities      
Purchase of treasury stock 203,043 113,327 38,735
Dividends paid (48,622) (33,408) (65,768)
Borrowings under long-term debt agreement 125,000 40,000 0
Other 8,312 2,257 1,554
Net cash used in financing activities (118,353) (104,478) (102,949)
Net increase (decrease) in cash and cash equivalents 57,076 (14,138) 77,003
Cash, cash equivalents and restricted cash beginning of year 535,474 549,612 472,609
Cash, cash equivalents and restricted cash at end of year 592,550 535,474 549,612
Supplemental disclosures of cash flow information      
Income taxes, net 38,299 40,730 40,872
Cash paid for interest 7,421 4,006 3,257
ROU assets obtained in exchange for lease obligations 24,474 0 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]      
Cash and cash equivalents 367,342 326,773 354,260
Restricted Cash and Cash Equivalents, Current 49,295 42,227 41,137
Deposits workers' compensation $ 175,913 $ 166,474 $ 154,215