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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 | $ 219,923 | $ 205,544 | $ 98,177
Adjustments to reconcile net income to net cash provided by operations: |  |  |
Depreciation and amortization | 45,205 | 38,863 | 35,625
Stock option expense | 14,831 | 12,611 | 10,485
Accrued litigation settlement | 6,000 |  |
Noncash portion of long-term incentive compensation | 5,740 | 5,405 | 3,774
Provision/(benefit) for deferred income taxes (Note 11) | (2,770) | 5,187 | 2,407
Noncash directors' compensation | 767 | 766 | 766
Loss on sale of transportation equipment (Note 19) | 2,266 |  | 5,266
Amortization of debt issuance costs | 306 | 441 | 516
Amortization of restricted stock awards |  | 446 | 1,231
Provision for uncollectible accounts receivable |  |  | 17,306
Changes in operating assets and liabilities: |  |  |
Decrease/(increase) in accounts receivable | (19,247) | (5,570) | 1,072
Decrease/(increase) in inventories | (1,757) | (351) | 421
Increase in prepaid expenses | (3,491) | (2,665) | (2,987)
Increase in accounts payable and other current liabilities | 28,417 | 8,935 | 12,890
Net change in lease assets and liabilities | 3,108 |  |
Change in current income taxes | 161 | 18,898 | (26,104)
Increase in other assets | (11,963) | (5,544) | (8,330)
Increase in other liabilities | 12,354 | 3,451 | 8,561
Other sources | 1,399 | 721 | 1,419
Net cash provided by operating activities | 301,249 | 287,138 | 162,495
Cash Flows from Investing Activities |  |  |
Business combinations, net of cash acquired (Note 7) | (138,010) | (53,177) | (4,725)
Capital expenditures | (53,022) | (52,872) | (64,300)
Other sources | 272 | 824 | 1,417
Net cash used by investing activities | (190,760) | (105,225) | (67,608)
Cash Flows from Financing Activities |  |  |
Proceeds from revolving line of credit | 482,900 | 469,550 | 212,350
Payments on revolving line of credit | (482,100) | (406,550) | (211,150)
Purchases of treasury stock | (92,631) | (158,884) | (94,640)
Proceeds from exercise of stock options (Note 4) | 34,380 | 32,412 | 27,092
Capital stock surrendered to pay taxes on stock-based compensation | (28,474) | (27,548) | (14,223)
Dividends paid | (19,788) | (18,662) | (17,371)
Change in cash overdrafts payable | (3,927) | (1,531) | 6,700
Payments on other long-term debt |  | (75,000) | (8,750)
Debt issuance costs |  | (1,052) |
Other sources/(uses) | 478 | (938) | 916
Net cash used by financing activities | (109,162) | (188,203) | (99,076)
Increase/(decrease) in cash and cash equivalents | 1,327 | (6,290) | (4,189)
Cash and cash equivalents at beginning of year | 4,831 | 11,121 | 15,310
Cash and cash equivalents at end of year | $ 6,158 | $ 4,831 | $ 11,121

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + 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 maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the settlement of obligation drawn 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 maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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