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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 64,581 | $ 83,524 | $ 88,226
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 13,940 | 9,272 | 8,886
Bad debt provision | 25,480 | 51,387 | 6,250
Deferred income tax (benefit) expense | (684) | (13,013) | 1,887
Stock-based compensation expense | 6,865 | 5,900 | 5,985
Amortization of premium on marketable securities | 1,434 | 1,373 | 1,296
Unrealized (gain) loss on deferred compensation fund investments | (7,257) | 1,429 | (4,509)
Changes in operating assets and liabilities: |  |  |
Accounts and notes receivable | (29,532) | (44,363) | (121,639)
Inventories and supplies | 4,765 | 950 | (1,873)
Prepaid expenses and other assets | 3,480 | 1,054 | (9,545)
Deferred compensation funding | (738) | (1,536) | (257)
Accounts payable and other accrued expenses | (9,532) | (9,144) | 11,197
Accrued payroll, accrued and withheld payroll taxes | 3,517 | 6,085 | 11,927
Accrued insurance claims | 7,845 | (5,099) | (2,954)
Deferred compensation liability | 8,482 | 450 | 5,061
Income taxes payable | 935 | (8,238) | 7,692
Net cash provided by operating activities | 93,581 | 80,031 | 7,630
Cash flows from investing activities: |  |  |
Disposals of fixed assets | 199 | 640 | 338
Additions to property and equipment | (4,368) | (4,940) | (5,397)
Purchases of marketable securities | (33,544) | (14,297) | (33,861)
Sales of marketable securities | 21,256 | 9,011 | 28,537
Cash paid for acquisitions | 0 | 0 | (4,584)
Net cash used in investing activities | (16,457) | (9,586) | (14,967)
Cash flows from financing activities: |  |  |
Dividends paid | (58,951) | (57,201) | (55,244)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan | 90 | 89 | 95
Proceeds from the exercise of stock options | 3,628 | 8,801 | 12,808
Net (repayments) proceeds from short-term borrowings | (20,000) | (5,382) | 35,382
Payments of statutory withholding on net issuance of restricted stock units | (587) | (284) | 0
Net cash used in financing activities | (75,820) | (53,977) | (6,959)
Net change in cash and cash equivalents | 1,304 | 16,468 | (14,296)
Cash and cash equivalents at beginning of the period | 26,025 | 9,557 | 23,853
Cash and cash equivalents at end of the period | 27,329 | 26,025 | 9,557
Supplementary cash flow information: |  |  |
Cash paid for interest | 3,459 | 3,094 | 1,363
Cash paid for income taxes, net of refunds | 20,026 | 37,680 | 35,367
Contingent shares settled pursuant to acquisition | $ 1,012 | $ 2,291 | $ 0

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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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