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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 35,337 $ 13,861
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 57,528 47,611
Stock compensation expense 4,259 1,209
Deferred income taxes 10,898 (22,139)
Amortization of unfavorable lease liabilities and deferred credits (8,379) (8,295)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes 3,147 3,577
Loss on extinguishment of debt 3,616  
(Gain) loss on disposal of assets (49) 276
Provision for obsolete expendable parts and supplies 477 74
Lease termination 9,540 15,109
Changes in assets and liabilities:    
Receivables 5,903 (12,743)
Expendable parts and supplies (5,076) (677)
Prepaid expenses and other current assets (7,861) 4,727
Accounts payable (4,888) 8,361
Accrued liabilities 9,625 12,212
Net cash provided by operating activities 114,077 63,163
Cash flows from investing activities:    
Capital expenditures (116,731) (98,509)
Sales of investment securities 20,077  
Net returns of lease and equipment deposits 621 (2,673)
Net cash used in investing activities (96,033) (101,182)
Cash flows from financing activities:    
Proceeds from long-term debt 163,658 187,703
Principal payments on long-term debt and capital leases (197,409) (158,170)
Debt financing costs (4,870) (5,767)
Debt prepayment costs (1,672)  
Stock issuance costs 185  
Repurchase of stock (1,514) (540)
Net cash (used in) provided by financing activities (41,622) 23,226
Net change in cash, cash equivalents and restricted cash (23,578) (14,793)
Cash, cash equivalents and restricted cash at beginning of period 107,134 60,347
Cash, cash equivalents and restricted cash at end of period 83,556 45,554
Supplemental cash flow information    
Cash paid for interest 37,587 35,199
Cash paid for income taxes, net 415 368
Supplemental non-cash investing and financing activities    
Accrued capital expenditures $ 836 1,087
Acquisition of capital leases   $ 10,473