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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net income | $ 53,230 | $ 25,076
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 36,986 | 32,294
Stock-based compensation expense | 8,132 | 9,017
Deferred tax benefit | (38,429) | (2,063)
Gain on sale of assets | (813) | (403)
Unrealized gain on investments | (199) | (1,411)
Changes in working capital items | (7,818) | (5,095)
Increase in other assets | (8,192) | (9,105)
Increase (decrease) in other liabilities | 3,361 | (2,041)
Increase in pension and postretirement benefits | 6,267 | 7,696
Other operating activities, net | 3,745 | (9,679)
Net cash provided by operating activities | 56,270 | 44,286
Cash flows from investing activities: |  |
Capital expenditures | (21,854) | (13,250)
Acquisitions, net of cash acquired | (119,689) | (92,564)
Proceeds from sale of assets | 1,731 | 960
Purchases of investments | (11,746) | 0
Net cash used in investing activities | (151,558) | (104,854)
Cash flows from financing activities: |  |
Proceeds from long-term debt | 627,192 | 239,427
Payments on long-term debt | (495,109) | (168,977)
Proceeds from the exercise of stock options | 0 | 14
Purchases of treasury stock | (18,305) | (9,173)
Dividends | (12,110) | (10,809)
Net cash provided by financing activities | 101,668 | 50,482
Effect of exchange rate changes on cash | 936 | (2,022)
Net change in cash and cash equivalents | 7,316 | (12,108)
Non-cash investing and financing activities: |  |
Acquisition of long-term asset under financing arrangement | $ 14,544 | $ 0

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