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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |
Net income | $ 144,738 | $ 134,572 | $ 95,128
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 14,031 | 16,597 | 16,860
Deferred income taxes | 7,706 | 1,037 | 194
Stock-based compensation | 6,930 | 6,344 | 5,187
Loss on disposal of property, plant and equipment | 285 | 47 | 1,738
Other non-cash adjustments | (218) | (406) | (406)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 12,701 | (24,281) | (10,486)
Inventories | 1,695 | (23,276) | (3,635)
Prepaid expenses and other assets | (1,652) | (613) | (2,194)
Accounts payable | (16,666) | 21,131 | (4,804)
Accrued expenses and other liabilities | (10,823) | 5,040 | 2,488
Income taxes receivable/payable | (2,375) | 1,929 | 1,795
Net cash provided by operating activities | 156,352 | 138,121 | 101,865
Investing Activities |  |  |
Expenditures for property, plant and equipment and intangibles | (67,265) | (33,816) | (15,040)
Proceeds from sales of property, plant and equipment | 21 | 83 | 55
Acquisition of business, net of cash acquired |  |  | (71,804)
Net cash used in investing activities | (67,244) | (33,733) | (86,789)
Financing Activities |  |  |
Borrowings under line of credit | 89,500 | 172,250 | 201,000
Principal payments under line of credit | (89,500) | (172,250) | (201,000)
Repurchases of common stock | (46,545) | (30,085) | (3,617)
Proceeds from employee stock purchase and option plans | 1,089 | 882 | 391
Financing costs | (518) |  |
Net cash used in financing activities | (45,974) | (29,203) | (3,226)
Net increase in cash and cash equivalents | 43,134 | 75,185 | 11,850
Cash and cash equivalents, beginning of period | 105,699 | 30,514 | 18,664
Cash and cash equivalents, end of period | 148,833 | 105,699 | 30,514
Supplemental Disclosure: |  |  |
Cash paid for interest | 321 | 662 | 418
Cash paid for income taxes, net | $ 39,612 | $ 48,238 | $ 44,802

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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://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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 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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- References No definition available. + Details
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