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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