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v3.20.4

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 14,055 | $ 23,425 | $ 22,817
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 37,739 | 37,112 | 38,439
Amortization | 11,053 | 11,315 | 13,400
Provision for doubtful accounts | 2,160 | 8,608 | 1,712
Deferred income taxes | (7,312) | (2,367) | 7,628
Asset impairments | 6,950 | 834 | 96
Insurance recoveries |  | (5,000) |
(Gain) loss on the sale of property, plant and equipment | (155) | 53 | (262)
Stock-based compensation expense | 10,398 | 10,194 | 10,089
Changes in operating assets and liabilities, net of effects from business acquisitions: |  |  |
Accounts receivable | 13,586 | 134,926 | (33,952)
Contract assets | 18,282 | (20,979) | 6,414
Inventories | (10,799) | (5,238) | (43,264)
Prepaid expenses and other assets | 4,080 | 2,494 | 10,238
Accounts payable | (15,553) | (121,860) | 61,391
Advance payments from customers | 46,611 | 9,254 | 7,275
Accrued liabilities | (9,826) | 19,623 | (1,497)
Operating leases | 724 | 1,029 |
Income taxes | (1,555) | (10,287) | (23,837)
Net cash provided by operations | 120,438 | 93,136 | 76,687
Cash flows from investing activities: |  |  |
Proceeds from sales of investments at par |  | 50 | 522
Additions to property, plant and equipment | (34,584) | (32,576) | (62,808)
Proceeds from the sale of property, plant and equipment | 368 | 259 | 239
Additions to purchased software | (4,935) | (2,542) | (3,924)
Cash received from business divestitures | 4,714 |  |
Business acquisitions, net of cash acquired |  |  | (2,731)
Other | 54 | (54) | (147)
Net cash used in investing activities | (34,383) | (34,863) | (68,849)
Cash flows from financing activities: |  |  |
Proceeds from stock options exercised | 958 | 1,585 | 3,631
Employee taxes paid for shares withheld | (2,236) | (2,231) | (1,408)
Dividends paid | (23,041) | (23,287) | (21,005)
Borrowings under credit agreement | 110,000 |  | 50,000
Borrowings under finance leases | 864 |  |
Principal payments on credit agreement | (117,500) | (5,626) | (106,999)
Principal payments on finance leases | (1,351) | (1,168) | (1,025)
Share repurchases | (25,220) | (122,110) | (211,858)
Debt issuance costs |  |  | (2,303)
Net cash used in financing activities | (57,526) | (152,837) | (290,967)
Effect of exchange rate changes | 3,505 | 418 | (1,315)
Net increase (decrease) in cash and cash equivalents and restricted cash | 32,034 | (94,146) | (284,444)
Cash and cash equivalents and restricted cash at beginning of year | 363,956 | 458,102 | 742,546
Cash and cash equivalents and restricted cash at end of year | $ 395,990 | $ 363,956 | $ 458,102

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