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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Cash flows from operating activities: |  |  |
Net income | $ 107,111 | $ 73,933 | $ 66,161
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 76,974 | 67,981 | 65,480
Stock-based compensation expense | 13,460 | 14,562 | 10,612
Deferred tax (benefit) provision | (23,125) | 9,725 | (3,971)
Gain on sale of assets | (2,190) | (776) | (73)
Gain on sale of investments | (3,771) | 0 | 0
Unrealized gain on investments | (1,304) | (2,660) | (1,426)
Changes in working capital items | (9,934) | 5,784 | 13,715
Increase in other assets | (9,872) | (17,256) | (5,591)
Increase (decrease) in other liabilities | 6,510 | (7,150) | 5,397
(Decrease) increase in pension and postretirement benefit obligations | (1,104) | 9,689 | (2,465)
Other operating activities, net | (5,181) | (4,533) | (7,565)
Net cash provided by operating activities | 147,574 | 149,299 | 140,274
Cash flows from investing activities: |  |  |
Capital expenditures | (43,200) | (44,935) | (41,682)
Acquisitions, net of cash acquired | (121,065) | (98,235) | (6,937)
Proceeds from sale of assets | 4,705 | 3,764 | 1,478
Proceeds from sale of investments | 9,158 | 0 | 0
Purchases of investments | (11,934) | (2,211) | 0
Net cash used in investing activities | (162,336) | (141,617) | (47,141)
Cash flows from financing activities: |  |  |
Proceeds from long-term debt | 704,188 | 417,043 | 90,421
Payments on long-term debt | (651,166) | (388,447) | (120,380)
Purchases of treasury stock | (21,181) | (14,025) | (57,998)
Proceeds from the exercise of stock options | 0 | 14 | 6,406
Dividends | (24,637) | (21,762) | (19,413)
Transactions with noncontrolling interests | 0 | 0 | (5,566)
Other financing activities | (6,303) | 0 | (2,318)
Net cash provided by (used in) financing activities | 901 | (7,177) | (108,848)
Effect of exchange rate changes on cash | (2,082) | 1,299 | (770)
Net change in cash and cash equivalents | (15,943) | 1,804 | (16,485)
Cash and cash equivalents at beginning of year | 57,515 | 55,711 | 72,196
Cash and cash equivalents at end of year | 41,572 | 57,515 | 55,711
Cash paid during the year for: |  |  |
Interest | 37,232 | 26,271 | 24,133
Income taxes | 11,014 | 8,472 | 11,855
Non-cash investing and financing activities: |  |  |
Acquisition of long-term asset under financing arrangement | $ 14,544 | $ 0 | $ 0

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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