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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash provided by (used for) operating activities: |  |
Net income (loss) | $ (587) | $ 119
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities: |  |
Depreciation and amortization | 8,243 | 7,645
Provision for doubtful accounts | 4 | 23
Provision for inventory write-downs | 756 | 659
Deferred income taxes | 913 | (496)
Shares issued for employee benefit plan | 335 | 346
Employee and director stock-based compensation | 2,204 | 2,623
Performance-based common stock warrants | 471 | 932
Changes in operating assets and liabilities: |  |
Accounts receivable and contract assets | (266) | (3,689)
Inventories | 1,372 | (1,564)
Prepaid expenses and other assets | (454) | (905)
Accounts payable and accrued liabilities | (21,160) | (16,182)
Accrued income taxes | (3,774) | (2,064)
Net cash provided by (used for) operating activities | (11,943) | (12,553)
Cash used for investing activities: |  |
Acquisitions of property, plant, and equipment | (9,314) | (6,460)
Acquisitions of intangible assets | (571) | (410)
Net cash used for investing activities | (9,885) | (6,870)
Cash provided by (used for) financing activities: |  |
Borrowings under line of credit | 13,000 | 53,000
Repayments on line of credit | (10,000) | (14,987)
Proceeds from stock options exercised | 439 | 237
Treasury stock purchased | (615) | (11,389)
Contingent consideration payments in connection with business combinations | (3,858) | 0
Net cash provided by (used for) financing activities | (1,034) | 26,861
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | 832 | 25
Net increase (decrease) in cash, cash equivalents, and restricted cash | (22,030) | 7,463
Cash, cash equivalents, and restricted cash at beginning of year | 67,339 | 59,834
Cash, cash equivalents, and restricted cash at end of period | 45,309 | 67,297
Supplemental cash flow information: |  |
Income taxes paid | 2,893 | 2,925
Interest paid | $ 1,164 | $ 414

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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