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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Cash flows from operating activities: |  |  |
Net income (loss) | $ 16,335 | $ 5,008 | $ (43,590)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 23,163 | 24,811 | 28,115
Stock based compensation | 7,912 | 6,183 | 3,240
Change in fair value of contingent consideration | 250 | (15,261) | 948
Deferred income tax provision | (8,947) | 4,428 | 39,983
Changes in accounts receivable allowances | 179 | (313) | 2,377
Fixed and intangible asset impairments and disposals | 540 | 3,930 | 1,190
Write-off of other assets | 0 | 2,685 | 0
Other | (605) | (586) | 90
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 5,044 | 8,479 | 3,131
Inventories | 5,740 | 687 | 11,976
Prepaid expenses and other | (1,231) | (3,520) | 712
Accounts payable, accrued and other liabilities | (7,093) | 19,214 | (2,956)
Net cash provided by operating activities | 41,287 | 55,745 | 45,216
Cash flows from investing activities: |  |  |
Additions to property, plant and equipment | (2,391) | (3,001) | (2,326)
Acquisition of intangibles | (1,265) | 0 | (3,268)
Acquisition of warrants | 0 | 0 | (2,000)
Proceeds from sale or maturity of marketable securities | 0 | 450 | 25
Net cash used in investing activities | (3,656) | (2,551) | (7,569)
Cash flows from financing activities: |  |  |
Proceeds from issuance of and borrowings on long-term debt | 0 | 116,471 | 0
Repayment of long-term debt | (5,000) | (140,381) | (16,250)
Deferred financing costs on long-term debt | 0 | (1,364) | 0
Payment of acquisition related contingent consideration | (9,500) | (9,850) | (9,850)
Repurchase of common stock | 0 | (13,557) | 0
Proceeds from exercise of stock options and employee stock purchase plan | 2,949 | 10,698 | 2,437
Net cash used in financing activities | (11,551) | (37,983) | (23,663)
Effect of exchange rate changes on cash and cash equivalents | 472 | 0 | (42)
Increase in cash and cash equivalents | 26,552 | 15,211 | 13,942
Cash and cash equivalents at beginning of year | 47,544 | 32,333 | 18,391
Cash and cash equivalents at end of year | 74,096 | 47,544 | 32,333
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Contractual obligations for purchase of fixed assets | 56 | 26 | 75
Cash paid (received) during the year for: |  |  |
Interest | 3,190 | 2,969 | 3,063
Income taxes | $ 36 | $ (102) | $ 332

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- Definition The cash inflow from a debt initially having maturity due after one year or beyond 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=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments. + 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 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 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 cash outflow for debt initially having maturity due after one year or beyond the normal 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=109223946&loc=d3e3291-108585 + 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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