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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 |  | $ 83,524 | $ 88,226 | $ 77,396
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 9,272 | 8,886 | 7,496
Bad debt provision |  | 51,387 | 6,250 | 4,629
Deferred income tax (benefit) expense |  | (13,013) | 1,887 | 3,001
Stock-based compensation expense | [1] | 5,900 | 5,985 | 4,252
Tax benefit from equity compensation plans | [1] | 0 | 0 | (2,981)
Amortization of premium on marketable securities |  | 1,373 | 1,296 | 1,723
Unrealized loss (gain) on deferred compensation fund investments |  | 1,429 | (4,509) | (1,460)
Changes in operating assets and liabilities: |  |  |  |
Accounts and notes receivable |  | (44,363) | (121,639) | (65,610)
Inventories and supplies |  | 950 | (1,873) | (1,492)
Prepaid expenses and other assets |  | 1,054 | (9,545) | (2,470)
Deferred compensation funding |  | (1,536) | (257) | 2,732
Accounts payable and other accrued expenses |  | (9,144) | 11,197 | (4,251)
Accrued payroll, accrued and withheld payroll taxes |  | 6,085 | 11,927 | 6,307
Accrued insurance claims |  | (5,099) | (2,954) | 5,404
Deferred compensation liability |  | 450 | 5,061 | (731)
Income taxes payable | [1] | (8,238) | 7,692 | 7,455
Net cash provided by operating activities |  | 80,031 | 7,630 | 41,400
Cash flows from investing activities: |  |  |  |
Disposals of fixed assets |  | 640 | 338 | 275
Additions to property and equipment |  | (4,940) | (5,397) | (5,442)
Purchases of marketable securities |  | (14,297) | (33,861) | (29,449)
Sales of marketable securities |  | 9,011 | 28,537 | 28,164
Cash paid for acquisitions |  | 0 | (4,584) | 0
Net cash used in investing activities |  | (9,586) | (14,967) | (6,452)
Cash flows from financing activities: |  |  |  |
Dividends paid |  | (57,201) | (55,244) | (53,342)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan |  | 89 | 95 | 109
Tax benefit from equity compensation plans |  | 0 | 0 | 2,981
Proceeds from the exercise of stock options |  | 8,517 | 12,808 | 5,968
Net (repayments) proceeds from short-term borrowings |  | (5,382) | 35,382 | 0
Net cash used in financing activities |  | (53,977) | (6,959) | (44,284)
Net change in cash and cash equivalents |  | 16,468 | (14,296) | (9,336)
Cash and cash equivalents at beginning of the period |  | 9,557 | 23,853 | 33,189
Cash and cash equivalents at end of the period |  | 26,025 | 9,557 | 23,853
Supplementary cash flow information: |  |  |  |
Cash paid for interest |  | 3,094 | 1,363 | 574
Cash paid for income taxes, net of refunds |  | 37,680 | 35,367 | 32,532
Contingent shares settled pursuant to acquisition |  | $ 2,291 | $ 0 | $ 0
[1] | The Company adopted the provisions of ASU 2016-09 prospectively, and as such the amounts reflected for the year ended December 31, 2016 have not been adjusted.

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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 No definition available. + Details
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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=109223946&loc=d3e3179-108585 + 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://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=109197908&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=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + 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://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=109223946&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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