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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Operating Activities |  |
Net income | $ 87,457 | $ 72,004
Adjustments to reconcile net income to cash provided by operations: |  |
Depreciation and amortization | 27,854 | 25,229
Stock-based compensation expense | 5,696 | 5,692
(Gain) loss on disposal of property, plant and equipment | (24) | 153
Changes in operating assets and liabilities, net of acquisitions |  |
Accounts receivable and unbilled accounts receivable | (66,347) | (96,481)
Inventories | (50,755) | (32,145)
Accounts payable | 32,096 | (24,690)
Accrued income taxes | 14,004 | 2,188
Accrued liabilities and customer deposits | (1,529) | 85,303
Other assets and liabilities | (24,252) | (63,349)
Net cash provided by (used for) operating activities | 24,200 | (26,096)
Investing Activities |  |
Purchase of property, plant and equipment | (17,466) | (19,327)
Proceeds from disposal of property, plant and equipment | 7,898 | 284
Acquisitions of businesses, net of cash acquired | (34,297) | (800,081)
Net cash used for investing activities | (43,865) | (819,124)
Financing Activities |  |
Proceeds from debt | 306,610 | 458,273
Payments of debt | (266,347) | (482,591)
Proceeds from exercise of stock options and other benefit plans | 2,873 | 1,259
Payment of income tax withholding on share-based compensation | (2,937) | (6,842)
Cash dividends ($0.12 and $0.10 per share for the three months ended March 31, 2018 and 2017, respectively) | (11,531) | (9,572)
Net cash provided by (used for) financing activities | 28,668 | (39,473)
Effect of changes in currency exchange rates | 7,482 | 21,640
Increase (Decrease) in cash | 16,485 | (863,053)
Cash, cash equivalents and restricted cash, beginning of period | 233,401 | 1,143,232
Cash and cash equivalents, end of period | $ 249,886 | $ 280,179

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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
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