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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |
Net income | $ 133,383 | $ 83,019 | $ 32,585
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 62,085 | 68,800 | 61,517
Amortization | 8,710 | 10,236 | 10,439
Change in deferred taxes and other liabilities | 13,702 | 8,972 | (1,264)
Provision for write-off of property, plant and equipment | 3,119 | 3,707 | 2,870
Non-cash interest expense | 605 | 459 | 660
Write-off of pension liability adjustment due to settlement/curtailment | 450 | 1,494 |
Compensation and benefits paid or payable in Class A Common Stock | 2,063 | 2,203 | 2,133
Write-off of intangible assets in a discontinued product line |  |  | 4,149
Changes in operating assets and liabilities that provided/(used) cash, net of impact of business acquisition: |  |  |
Accounts receivable | 9,587 | (19,139) | (21,859)
Contract assets | (19,199) | (10,267) |
Inventories | (8,923) | (968) | 3,090
Prepaid expenses and other current assets | (2,291) | (5,815) | (4,989)
Income taxes prepaid and receivable | 1,390 | (1,402) | (941)
Accounts payable | 10,524 | 9,340 | 2,910
Accrued liabilities | (7,393) | 8,209 | 5,303
Income taxes payable | 3,979 | (824) | (799)
Noncurrent receivable | (1,341) | (12,249) | (18,766)
Noncurrent liabilities | (6,573) | (5,479) | (10,145)
Other, net | (3,525) | (7,811) | (2,677)
Net cash provided by operating activities | 200,352 | 132,485 | 64,216
Investing Activities |  |  |
Purchase of business, net of cash acquired | (30,793) |  |
Purchases of property, plant and equipment | (67,358) | (81,579) | (85,510)
Purchased software | (597) | (1,307) | (2,127)
Net cash used in investing activities | (98,748) | (82,886) | (87,637)
Financing Activities |  |  |
Proceeds from borrowings | 45,000 | 26,031 | 115,334
Principal payments on debt | (120,017) | (29,913) | (84,047)
Principal payments on finance lease liabilities | (1,180) |  |
Debt acquisition costs |  |  | (2,130)
Cash received to settle swap agreements |  |  | 6,346
Taxes paid in lieu of share issuance | (971) | (1,652) | (1,364)
Proceeds from options exercised | 112 | 202 | 597
Dividends paid | (23,251) | (21,926) | (21,869)
Net cash (used in)/provided by financing activities | (100,307) | (27,258) | 12,867
Effect of exchange rate changes on cash and cash equivalents | (3,512) | (8,313) | 12,539
Increase/(decrease) in cash and cash equivalents | (2,215) | 14,028 | 1,985
Cash and cash equivalents at beginning of year | 197,755 | 183,727 | 181,742
Cash and cash equivalents at end of year | $ 195,540 | $ 197,755 | $ 183,727

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