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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net income | $ 84,402 | $ 65,991 | $ 39,390
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 18,182 | 16,644 | 18,565
Impairment charges and other | 0 | 0 | 10,480
Amortization of marketable securities | 80 | 90 | 836
Stock-based compensation | 24,345 | 16,643 | 13,345
Deferred income taxes | 9,742 | 2,951 | (14,733)
Changes in operating assets and liabilities: |  |  |
Restricted cash | 1,500 | (5,219) | 6,622
Accounts receivable | (63,697) | (69,619) | (25,549)
Prepaid insurance | 4,259 | (7,624) | 13,884
Other current assets | (7,465) | (2,391) | 514
Other assets | (12,773) | (8,941) | (22,069)
Accounts payable | 2,258 | (1,192) | 707
Payroll taxes and other payroll deductions payable | 55,481 | 42,373 | 29,052
Accrued worksite employee payroll expense | 52,188 | 53,297 | (30,479)
Accrued health insurance costs | (285) | 12,717 | (4,686)
Accrued workers’ compensation costs | 23,945 | 21,723 | 26,159
Accrued corporate payroll, commissions and other accrued liabilities | 17,138 | 3,150 | 4,105
Income taxes payable/receivable | (4,875) | (7,920) | (1,060)
Total adjustments | 120,023 | 66,682 | 25,693
Net cash provided by operating activities | 204,425 | 132,673 | 65,083
Marketable securities: |  |  |
Purchases | (1,752) | (1,049) | (10,558)
Proceeds from maturities | 1,561 | 1,715 | 10,593
Proceeds from dispositions | 0 | 7,268 | 17,869
Property and equipment: |  |  |
Purchases | (33,337) | (33,994) | (17,844)
Proceeds from sale of aircraft | 0 | 0 | 12,159
Proceeds from dispositions | 278 | 43 | 153
Net cash provided by (used in) investing activities | (33,250) | (26,017) | 12,372
Cash flows from financing activities: |  |  |
Purchase of treasury stock | (38,735) | (31,669) | (67,113)
Repurchase of common stock | 0 | 144,263 | 0
Dividends paid | (65,768) | (20,599) | (21,153)
Borrowings under long-term debt agreement | 0 | 124,400 | 0
Principal repayments | 0 | (20,000) | 0
Proceeds from the exercise of stock options | 0 | 598 | 374
Income tax benefit from stock-based compensation | 0 | 0 | 2,216
Other | 1,554 | 1,373 | 1,303
Net cash used in financing activities | (102,949) | (90,160) | (84,373)
Net increase (decrease) in cash and cash equivalents | 68,226 | 16,496 | (6,918)
Cash and cash equivalents at beginning of year | 286,034 | 269,538 | 276,456
Cash and cash equivalents at end of year | 354,260 | 286,034 | 269,538
Supplemental disclosures of cash flow information: |  |  |
Income taxes, net | 40,872 | 44,148 | 39,806
Interest expense | $ 3,213 | $ 2,396 | $ 459

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from the sale of other assets recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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