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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 flows from operating activities: |  |  |
Net income | $ 35,815 | $ 39,979 | $ 26,555
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 13,749 | 14,484 | 15,053
Pension expense | 2,823 | 4,909 | 6,368
Contributions to pension plan |  | (4,000) | (2,000)
Deferred income tax charge (benefit) | (1,198) | 337 | (6,140)
(Gain) loss on sale of property, plant and equipment | (53) | (44) | 153
Stock based compensation | 1,025 | 1,674 | 743
Impairment of goodwill and other intangible assets |  |  | 4,098
Changes in operating assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable, net | 2,218 | (1,196) | 5,473
Inventories, net | 11,452 | (13,601) | (4,305)
Accounts payable | (601) | 1,299 | (1,268)
Commissions payable | (2,140) | 1,737 | (3,849)
Deferred revenue and customer deposits | (321) | 741 | (902)
Accrued expenses and other | 153 | 1,928 | 3,215
Income taxes | (697) | (6,599) | 7,950
Benefit obligations | (51) | (438) | (7,879)
Net cash provided by operating activities | 62,174 | 41,210 | 43,265
Cash flows from investing activities: |  |  |
Capital additions | (10,912) | (10,947) | (7,754)
Proceeds from sale of property, plant and equipment | 69 | 512 | 320
(Purchase of) Proceeds from short-term investments, net | (4) | 2,967 | (2,976)
Net cash used for investing activities | (10,847) | (7,468) | (10,410)
Cash flows from financing activities: |  |  |
Regular cash dividends | (14,370) | (13,317) | (12,268)
Special cash dividend |  | (52,234) |
Treasury share repurchases | (2,610) |  |
Other | (383) |  |
Net cash used for financing activities | (17,363) | (65,551) | (12,268)
Effect of exchange rate changes on cash | 133 | (1,413) | 1,489
Net increase (decrease) in cash and cash equivalents | 34,097 | (33,222) | 22,076
Cash and cash equivalents: |  |  |
Beginning of year | 46,458 | 79,680 | 57,604
End of period | $ 80,555 | $ 46,458 | $ 79,680

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