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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash provided by operating activities: |  |  |
Net income (loss) | $ 3,630 | $ 11,924 | $ (10,323)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 31,926 | 33,602 | 31,312
Provision for doubtful accounts | 441 | 305 | 166
Gain on sale of Guangzhou factory | 0 | (36,978) | 0
Deferred income taxes | (1,779) | 3,967 | 7,597
Shares issued for employee benefit plan | 947 | 1,062 | 648
Employee and director stock-based compensation | 8,845 | 8,820 | 11,943
Performance-based common stock warrants | 1,997 | 163 | 683
Impairment of long-term assets | 1,506 | 4,907 | 4,100
Changes in operating assets and liabilities: |  |  |
Accounts receivable and contract assets | 17,203 | 5,455 | (22,192)
Inventories | (1,914) | (11,215) | (25,797)
Prepaid expenses and other assets | 4,648 | (587) | (4,477)
Accounts payable and accrued liabilities | 14,233 | (7,386) | 10,970
Accrued income taxes | 3,574 | (1,184) | 4,535
Net cash provided by operating activities | 85,257 | 12,855 | 9,165
Cash provided by (used for) investing activities: |  |  |
Proceeds from sale of Guangzhou factory | 0 | 51,291 | 0
Acquisitions of property, plant and equipment | (21,313) | (20,142) | (40,384)
Refund of deposit received toward sale of Guangzhou factory | 0 | (5,053) | 0
Acquisitions of intangible assets | (2,655) | (2,521) | (1,949)
Acquisition of net assets of Residential Control Systems, Inc. | 0 | 0 | (8,894)
Net cash provided by (used for) investing activities | (23,968) | 23,575 | (51,227)
Cash provided by (used for) financing activities: |  |  |
Borrowings under line of credit | 72,500 | 68,000 | 157,000
Repayments on line of credit | (106,000) | (104,500) | (68,987)
Proceeds from stock options exercised | 448 | 864 | 1,442
Treasury stock purchased | (1,928) | (13,824) | (39,085)
Contingent consideration payments in connection with business combinations | (4,251) | (3,858) | 0
Net cash provided by (used for) financing activities | (39,231) | (53,318) | 50,370
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (963) | 2,756 | (803)
Net increase (decrease) in cash, cash equivalents and restricted cash | 21,095 | (14,132) | 7,505
Cash, cash equivalents and restricted cash at beginning of year | 53,207 | 67,339 | 59,834
Cash, cash equivalents and restricted cash at end of period | 74,302 | 53,207 | 67,339
Supplemental cash flow information: |  |  |
Income taxes paid | 7,275 | 7,658 | 8,280
Interest paid | $ 4,403 | $ 4,981 | $ 2,751

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