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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 provided by (used in) operating activities: |  |  |  |
Net income |  | $ 55,505 | $ 26,900 | $ 44,934
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | (11,408) | (2,193) | (18,217)
Depreciation and amortization |  | 32,863 | 29,163 | 27,777
Provision (recovery) for losses on accounts receivable |  | 6,283 | 1,639 | (639)
Change in deferred taxes |  | 14,685 | 10,134 | 9,670
Gain on sale of security business | [2] | (7,043) |  |
Changes in operating assets and liabilities net of amounts related to acquisitions: |  |  |  |
(Increase) decrease in receivables |  | (37,149) | (19,844) | 10,965
Decrease (increase) in inventories |  | 4,177 | (10,598) | 9,979
Increase in other assets |  | (11,924) | (140) | (2,354)
Increase (decrease) in accounts payable |  | 9,703 | 2,169 | (705)
(Decrease) increase in customer credit balances |  | (6,563) | (23,085) | 6,490
Increase in other current and long-term liabilities |  | 8,331 | 6,913 | 14,057
Net cash provided by operating activities |  | 57,460 | 21,058 | 101,957
Cash flows provided by (used in) investing activities: |  |  |  |
Capital expenditures |  | (13,590) | (12,164) | (10,134)
Proceeds from sales of fixed assets |  | 503 | 734 | 318
Proceeds from sale of security business | [2] | 6,824 |  |
Purchase of investments | [3] | (35,242) | (11,647) |
Acquisitions |  | (23,747) | (43,304) | (9,815)
Net cash used in investing activities |  | (65,252) | (66,381) | (19,631)
Cash flows provided by (used in) financing activities: |  |  |  |
Revolving credit facility borrowings |  | 161,604 |  |
Revolving credit facility repayments |  | (160,104) |  |
Proceeds from term loan |  | 100,000 |  |
Loan repayments |  | (76,300) | (16,200) | (7,500)
Distributions |  | (25,603) | (24,322) | (23,092)
Unit repurchases |  | (26,714) |  | (12,017)
Customer retainage payments |  | (918) | (575) | (740)
Payments of debt issuance costs |  | (2,100) | (60) | (297)
Net cash used in financing activities |  | (30,135) | (41,157) | (43,646)
Net (decrease) increase in cash, cash equivalents and restricted cash |  | (37,927) | (86,480) | 38,680
Cash, cash equivalents and restricted cash at beginning of period |  | 52,708 | 139,188 | 100,508
Cash, cash equivalents and restricted cash at end of period |  | $ 14,781 | $ 52,708 | $ 139,188
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | See Note 2 - Other income, net.
[3] | See Note 2 - Investments.

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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 derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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