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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Activities |  |  |
Net income | $ 262,290 | $ 313,404 | $ 398,628
Adjustments to reconcile net income to cash provided by operations: |  |  |
Depreciation and amortization | 103,248 | 69,795 | 64,734
Stock-based compensation expense | 21,287 | 20,813 | 26,019
Deferred income taxes | (67,423) | (10,228) | 4,981
Loss on disposal of property, plant and equipment | 1,907 | 232 | 587
Changes in operating assets and liabilities, net of acquisitions |  |  |
Accounts receivable and unbilled accounts receivable | (68,676) | 19,728 | 21,500
Inventories | (8,955) | 45,340 | 20,147
Accounts payable | (91,722) | (18,932) | (76,650)
Accrued income taxes | 47,644 | (11,759) | 21,740
Accrued liabilities and customer deposits | (18,891) | (11,338) | (14,837)
Other assets and liabilities | 8,102 | 33,475 | (16,005)
Net cash provided by operating activities | 188,811 | 450,530 | 450,844
Investing Activities |  |  |
Purchase of property, plant and equipment | (89,466) | (50,216) | (49,428)
Proceeds from disposal of property, plant and equipment | 1,291 | 363 | 1,784
Acquisitions of business, net of cash acquired | (921,537) | (183,113) | (129,550)
Deposit in escrow | 733,983 | (542,099) | (202,942)
Net cash used for investing activities | (275,729) | (775,065) | (380,136)
Financing Activities |  |  |
Proceeds from debt | 1,216,740 | 1,875,000 | 787,400
Payments of debt | (1,269,537) | (1,102,748) | (612,680)
Stock re-purchase | 0 | (212,176) | (387,787)
Proceeds from exercise of stock options and other benefit plans | 4,428 | 1,983 | 3,097
Payment of income tax withholding on share-based compensation | (6,844) | (6,658) | (14,565)
Cash dividends ($0.44, $0.36, and $0.28 per share for the years ended December 31, 2017, 2016 and 2015) | (42,218) | (32,430) | (26,963)
Net cash (used for) provided by financing activities | (97,431) | 522,971 | (251,498)
Effect of changes in currency exchange rates | 19,266 | (26,143) | (18,868)
(Decrease) increase in cash | (165,083) | 172,293 | (199,658)
Cash, beginning of year | 398,484 | 226,191 | 425,849
Cash, end of year | $ 233,401 | $ 398,484 | $ 226,191

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