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CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 42,017 | $ 27,523 | $ 20,121
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 69,546 | 53,582 | 43,755
Gain on bargain purchase | 0 | (11,039) | 0
Losses on sales and/or abandonment of property and equipment | 625 | 427 | 530
Write-off of patents and intangible assets | 814 | 988 | 101
Acquired in-process research and development | 644 | 12,136 | 461
Amortization of deferred credits | (142) | (147) | (170)
Amortization of long-term debt issuance costs | 804 | 685 | 952
Deferred income taxes | 2,052 | (1,304) | (962)
Excess tax benefits from stock-based compensation | 0 | 0 | (669)
Stock-based compensation expense | 6,117 | 4,075 | 2,506
Changes in operating assets and liabilities, net of effects from acquisitions: |  |  |
Trade receivables | (27,522) | (12,844) | (6,816)
Other receivables | (2,754) | (3,557) | 1,161
Inventories | (28,172) | (17,834) | (3,656)
Prepaid expenses and other current assets | (2,000) | (1,236) | 271
Prepaid income taxes | (444) | (611) | 404
Income tax refund receivables | 232 | (588) | 406
Other assets | 315 | (3,735) | (3,763)
Trade payables | 15,726 | 417 | (6,835)
Accrued expenses | 12,706 | 6,461 | 3,242
Income taxes payable | 918 | 21 | 1,451
Long-term income taxes payable | (4,454) | 4,846 | 0
Liabilities related to unrecognized tax benefits | 267 | (19) | 597
Deferred compensation payable | 39 | 1,970 | 712
Other long-term obligations | (801) | 2,510 | (200)
Total adjustments | 44,516 | 35,204 | 33,478
Net cash provided by operating activities | 86,533 | 62,727 | 53,599
Capital expenditures for: |  |  |
Property and equipment | (63,324) | (38,623) | (32,837)
Intangible assets | (3,012) | (2,577) | (2,217)
Proceeds from sale of cost method investment | 0 | 0 | 1,089
Proceeds from the sale of property and equipment | 55 | 21 | 19
Issuance of notes receivable | (10,750) | 0 | 0
Cash paid in acquisitions, net of cash acquired | (301,789) | (105,582) | (125,161)
Net cash used in investing activities | (378,820) | (146,761) | (159,107)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 214,993 | 143,810 | 5,271
Offering costs | (366) | (816) | 0
Proceeds from issuance of long-term debt | 639,108 | 197,214 | 219,505
Payments on long-term debt | (522,608) | (243,214) | (102,098)
Excess tax benefits from stock-based compensation | 0 | 0 | 669
Long-term debt issuance costs | 0 | (416) | (1,948)
Contingent payments related to acquisitions | (231) | (61) | (218)
Payment of taxes related to an exchange of common stock | (2,616) | 0 | (86)
Net cash provided by financing activities | 328,280 | 96,517 | 121,095
EFFECT OF EXCHANGE RATES ON CASH | (970) | 682 | (593)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 35,023 | 13,165 | 14,994
CASH AND CASH EQUIVALENTS: |  |  |
Beginning of year | 32,336 | 19,171 | 4,177
End of year | 67,359 | 32,336 | 19,171
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |  |  |
Interest (net of capitalized interest of $647, $513 and $460, respectively) | 10,324 | 7,707 | 8,872
Income taxes | 8,692 | 6,049 | 2,318
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |
Property and equipment purchases in accounts payable | 4,989 | 1,992 | 2,398
Contingent receivable in exchange for sale of equity investment | 0 | 0 | 711
Receivable for issuance of common stock associated with option exercises | 0 | 137 | 0
Acquisition purchases in accrued expenses and other long-term obligations | 72,209 | 10,488 | 0
Merit common stock surrendered (43, 0 and 14 shares, respectively) in exchange for exercise of stock options | $ 2,261 | $ 0 | $ 346

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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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