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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Operating Activities: |  |  |
Net income (loss) | $ (9,486) | $ 15,510 | $ 9,439
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation | 12,400 | 12,979 | 13,120
Amortization | 355 | 352 | 435
Stock-based compensation | 2,724 | 4,883 | 3,171
Excess tax benefit from stock-based compensation | 0 | 387 | 191
Bad debt expense/(recovery) | (160) | 187 | (29)
Deferred income tax expense | 100 | 2,330 | 10,521
Gain on amended supply agreement | (2,029) | (2,029) | (2,029)
Cash received from amended supply agreement | 2,333 | 2,333 | 2,333
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 47,983 | 369 | 391
Costs and billings in excess of estimates on uncompleted contracts | (3,270) | 39,612 | (17,430)
Inventories | 8,213 | 6,159 | (572)
Income taxes | (6,758) | (195) | (1,647)
Prepaid expenses and other current assets | 453 | 861 | 4,222
Accounts payable | (2,417) | (11,658) | (4,992)
Accrued liabilities | (11,676) | 3,927 | (3,373)
Other, net | (1,950) | (1,101) | (833)
Net cash provided by operating activities | 36,815 | 74,906 | 12,918
Investing Activities: |  |  |
Purchases of property, plant and equipment | (3,636) | (3,044) | (34,719)
Proceeds from sale of property, plant and equipment | 12 | 187 | 112
Purchases of short-term investments | (60,018) | 0 | 0
Maturities of short-term investments | 33,189 | 0 | 0
Changes in restricted cash | (24,851) | 0 | 0
Net cash used in investing activities | (55,304) | (2,857) | (34,607)
Financing Activities: |  |  |
Payments on industrial development revenue bonds | (400) | (400) | (400)
Excess tax benefit from stock-based compensation | 0 | (387) | (191)
Shares withheld in lieu of employee tax withholding | (398) | (1,000) | (740)
Purchase of treasury shares | 0 | (3,740) | (21,259)
Dividends paid | (11,875) | (11,845) | (12,358)
Net cash used in financing activities | (12,673) | (17,372) | (34,948)
Net increase (decrease) in cash and cash equivalents | (31,162) | 54,677 | (56,637)
Effect of exchange rate changes on cash and cash equivalents | 1,801 | (526) | (2,912)
Cash and cash equivalents, beginning of period | 97,720 | 43,569 | 103,118
Cash and cash equivalents, end of period | $ 68,359 | $ 97,720 | $ 43,569

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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash inflow from maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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