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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities |  |
Net income | $ 76,289 | $ 49,991
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 6,691 | 5,213
Stock-based compensation | 6,040 | 3,135
Deferred income taxes | 8,671 | 7,116
Changes in operating assets and liabilities: |  |
Accounts receivable | (20,674) | (2,567)
Prepaid insurance | (16,517) | (24,897)
Other current assets | (8,893) | (1,402)
Other assets | (809) | (1,952)
Accounts payable | (2,768) | (930)
Payroll taxes and other payroll deductions payable | 46,896 | (26,674)
Accrued worksite employee payroll expense | 33,883 | 14,072
Accrued health insurance costs | 10,679 | 20,720
Accrued workers’ compensation costs | 1,367 | 6,094
Accrued corporate payroll, commissions and other accrued liabilities | (23,656) | (24,854)
Income taxes payable/receivable | 498 | 7,129
Total adjustments | 41,408 | (19,797)
Net cash provided by operating activities | 117,697 | 30,194
Marketable securities: |  |
Purchases | (35,538) | (512)
Proceeds from dispositions | 5,499 | 0
Proceeds from maturities | 37,360 | 525
Property and equipment: |  |
Purchases | (5,608) | (6,585)
Net cash provided by (used in) investing activities | 1,713 | (6,572)
Cash flows from financing activities: |  |
Purchase of treasury stock | (29,037) | (8,565)
Dividends paid | 12,386 | 8,402
Other | 1,085 | 351
Net cash used in financing activities | (40,338) | (16,616)
Net decrease in cash, cash equivalents and restricted cash | 79,072 | 7,006
Cash, cash equivalents and restricted cash beginning of period | 535,474 | 549,612
Cash, cash equivalents and restricted cash end of period | 614,546 | 556,618
Supplemental Cash Flow Information [Abstract] |  |
Cash and cash equivalents | 398,936 | 354,641
Restricted cash | 44,705 | 41,137
Deposits workers compensation | 170,905 | 160,840
ROU assets obtained in exchange for lease obligations | $ 3,140 | $ 0

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