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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |
Net income | $ 10,785 | $ 19,081
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization | 20,552 | 18,491
Stock compensation expense | 1,320 | 1,454
Deferred income taxes | 3,205 | 5,953
Amortization of deferred credits | (1,103) | (1,188)
Unfavorable lease liabilities |  | (1,548)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes | 1,054 | 1,042
Loss (Gain) on disposal of assets | 407 | (1)
Provision for obsolete expendable parts and supplies | 97 | 122
Changes in assets and liabilities: |  |
Receivables | (1,040) | 8,275
Expendable parts and supplies | (1,158) | (1,866)
Prepaid expenses and other current assets | 327 | (2,042)
Accounts payable | (2,336) | (2,829)
Accrued liabilities | 5,791 | (799)
Change in operating lease right-of- use assets | 329 |
Net cash provided by operating activities | 38,230 | 44,145
Cash flows from investing activities: |  |
Capital expenditures | (10,124) | (26,036)
Sales of investment securities |  | 4,947
Lease and equipment deposits | (2,795) |
Returns of lease and equipment deposits | 91 | 760
Net cash used in investing activities | (12,828) | (20,329)
Cash flows from financing activities: |  |
Principal payments on long-term debt and financing leases | (36,467) | (38,605)
Debt financing costs | (184) | (258)
Stock issuance costs |  | 157
Repurchase of stock | (41) |
Net cash used in financing activities | (36,692) | (38,706)
Net change in cash, cash equivalents and restricted cash | (11,290) | (14,890)
Cash, cash equivalents and restricted cash at beginning of period | 72,501 | 107,134
Cash, cash equivalents and restricted cash at end of period | 61,211 | 92,244
Supplemental cash flow information |  |
Cash paid for interest | 9,440 | 12,266
Cash paid for income taxes, net | 15 |
Operating lease payments in operating cash flows | 9,534 |
Supplemental non-cash operating activities |  |
Right-of-use assets obtained in exchange of lease liabilities | 142,165 |
Supplemental non-cash investing activities |  |
Accrued capital expenditures | $ 334 | $ 5,635

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