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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Cash flows from operating activities: |  |
Net income | $ 23,842 | $ 18,769
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 32,294 | 32,158
Stock-based compensation expense | 9,017 | 5,267
Change in deferred taxes | (829) | 107
Gain on sale of assets | (403) | (347)
Unrealized gain on investments | (1,411) | (557)
Changes in working capital items | (5,095) | (6,635)
Increase in other assets | (9,105) | (3,181)
Decrease in other liabilities | (2,041) | (267)
Increase in pension and postretirement benefits | 7,696 | 6,751
Other, net | (9,679) | (174)
Net cash provided by operating activities | 44,286 | 51,891
Cash flows from investing activities: |  |
Capital expenditures | (13,250) | (23,946)
Acquisitions, net of cash acquired | (92,564) | (6,081)
Proceeds from sale of assets | 960 | 1,121
Net cash used in investing activities | (104,854) | (28,906)
Cash flows from financing activities: |  |
Proceeds from long-term debt | 239,427 | 22,055
Payments on long-term debt | (168,977) | (37,960)
Proceeds from the exercise of stock options | 14 | 1,798
Purchases of treasury stock | (9,173) | (8,209)
Dividends | (10,809) | (9,646)
Transaction with noncontrolling interests | 0 | (4,161)
Net cash provided by (used in) financing activities | 50,482 | (36,123)
Effect of exchange rate changes on cash | (2,022) | 274
Net change in cash and cash equivalents | $ (12,108) | $ (12,864)

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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=56944662&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=49171198&loc=d3e33268-110906 + Details
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