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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net income $ 19,081 $ 22,624
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 18,491 15,932
Stock compensation expense 1,454 428
Deferred income taxes 5,953 (19,253)
Amortization of unfavorable lease liabilities and deferred credits (2,736) (2,695)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes 1,042 1,769
(Gain) loss on disposal of assets (1) 82
Provision for obsolete expendable parts and supplies 122 62
Changes in assets and liabilities:    
Receivables 8,275 (1,442)
Expendable parts and supplies (1,866) (286)
Prepaid expenses and other current assets (2,042) 6,890
Accounts payable (2,829) 2,705
Accrued liabilities (799) 1,296
Net cash provided by operating activities 44,145 28,112
Cash flows from investing activities:    
Capital expenditures (26,036) (10,312)
Sales of investment securities 4,947  
Net returns of lease and equipment deposits 760 85
Net cash used in investing activities (20,329) (10,227)
Cash flows from financing activities:    
Proceeds from long-term debt   76,903
Principal payments on long-term debt and capital leases (38,605) (69,840)
Debt financing costs (258) (2,476)
Stock issuance costs 157  
Net cash (used in) provided by financing activities (38,706) 4,587
Net change in cash, cash equivalents and restricted cash (14,890) 22,472
Cash, cash equivalents and restricted cash at beginning of period 107,134 60,347
Cash, cash equivalents and restricted cash at end of period 92,244 82,819
Supplemental cash flow information    
Cash paid for interest 12,266 8,760
Cash paid for income taxes, net   $ 21
Supplemental non-cash investing and financing activities    
Accrued capital expenditures $ 5,635