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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Operating Activities |  |
Net income | $ 72,004 | $ 94,163
Adjustments to reconcile net income to cash provided by operations: |  |
Depreciation and amortization | 25,229 | 16,232
Stock-based compensation expense | 5,692 | 5,510
Loss on disposal of property, plant and equipment | 153 | 18
Changes in operating assets and liabilities, net of acquisitions |  |
Accounts receivable and unbilled accounts receivable | (96,481) | (23,844)
Inventories | (32,145) | 1,400
Accounts payable | (24,690) | (18,002)
Accrued income taxes | 2,188 | 29,779
Accrued liabilities and customer deposits | 85,303 | (12,832)
Other assets and liabilities | (63,349) | (16,858)
Net cash (used for) provided by operating activities | (26,096) | 75,566
Investing Activities |  |
Purchase of property, plant and equipment | (19,327) | (8,504)
Proceeds from disposal of property, plant and equipment | 284 | 84
Acquisitions of businesses, net of cash acquired | (67,581) | (210)
Release of deposit in escrow | 23,548 | 0
Net cash used for investing activities | (63,076) | (8,630)
Financing Activities |  |
Proceeds from debt | 458,273 | 195,000
Payments of debt | (482,591) | (85,453)
Purchase of treasury stock | 0 | (133,738)
Proceeds from exercise of stock options and other benefit plans | 1,259 | 515
Payment of income tax withholding on share-based compensation | (6,842) | (9,006)
Cash dividends ($0.10 and $0.08 per share for the three months ended March 31, 2017 and 2016, respectively) | (9,572) | (7,355)
Net cash used for financing activities | (39,473) | (40,037)
Effect of changes in currency exchange rates | 10,340 | 9,684
(Decrease) Increase in cash | (118,305) | 36,583
Cash, beginning of period | 398,484 | 226,191
Cash, end of period | $ 280,179 | $ 262,774

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- Definition 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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