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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |
Net income | $ 77,575 | $ 54,384
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 57,052 | 50,810
Stock-based compensation expense | 10,531 | 11,854
Deferred tax benefit | (43,272) | (4,836)
Gain on sale of assets | (925) | (332)
Unrealized gain on investments | (771) | (1,953)
Changes in working capital items | (5,897) | (2,908)
Increase in other assets | (11,932) | (11,227)
Increase (decrease) in other liabilities | 10,405 | (5,012)
(Decrease) increase in pension and postretirement benefits | (1,473) | 6,115
Other operating activities, net | (8,487) | (1,133)
Net cash provided by operating activities | 82,806 | 95,762
Cash flows from investing activities: |  |
Capital expenditures | (32,150) | (32,215)
Acquisitions, net of cash acquired | (119,953) | (96,320)
Proceeds from sale of assets | 3,358 | 1,515
Purchases of investments | (11,871) | 0
Other investing activities, net | 0 | (681)
Net cash used in investing activities | (160,616) | (127,701)
Cash flows from financing activities: |  |
Proceeds from long-term debt | 681,297 | 372,768
Payments on long-term debt | (566,891) | (311,718)
Proceeds from the exercise of stock options | 0 | 14
Purchases of treasury stock | (20,091) | (11,651)
Dividends | (18,528) | (16,193)
Net cash provided by financing activities | 75,787 | 33,220
Effect of exchange rate changes on cash | (1,777) | (240)
Net change in cash and cash equivalents | (3,800) | 1,041
Non-cash investing and financing activities: |  |
Acquisition of long-term asset under financing arrangement | $ 14,544 | $ 0

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