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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Operating Activities |  |
Net income | $ 144,164 | $ 184,648
Adjustments to reconcile net income to cash (used for) provided by operations: |  |
Depreciation and amortization | 51,051 | 33,093
Stock-based compensation expense | 11,879 | 9,673
Loss on disposal of property, plant and equipment | 525 | 378
Changes in operating assets and liabilities, net of acquisitions |  |
Accounts receivable and unbilled accounts receivable | (66,544) | (2,171)
Inventories | (48,406) | (10,893)
Accounts payable | (75,761) | (13,757)
Accrued income taxes | (23,025) | 2,913
Accrued liabilities and customer deposits | 86,937 | 3,505
Other assets and liabilities | (94,523) | 6,587
Net cash (used for) provided by operating activities | (13,703) | 213,976
Investing Activities |  |
Purchase of property, plant and equipment | (38,425) | (19,104)
Proceeds from disposal of property, plant and equipment | 471 | 165
Acquisitions of businesses, net of cash acquired | (114,175) | (21,263)
Release of deposit in escrow | 23,548 | 0
Net cash used for investing activities | (128,581) | (40,202)
Financing Activities |  |
Proceeds from debt | 745,035 | 230,000
Payments of debt | (680,145) | (175,499)
Purchase of treasury stock | 0 | (133,738)
Proceeds from exercise of stock options and other benefit plans | 2,679 | 651
Payment of income tax withholding on share-based compensation | (6,802) | (9,006)
Cash dividends ($0.XX and $0.16 per share for the six months ended June 30, 2017 and 2016, respectively) | (19,177) | (14,565)
Net cash provided by (used for) financing activities | 41,590 | (102,157)
Effect of changes in currency exchange rates | 30,732 | 5,127
(Decrease) Increase in cash | (69,962) | 76,744
Cash, beginning of period | 398,484 | 226,191
Cash, end of period | $ 328,522 | $ 302,935

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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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