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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 from operating activities:      
Net income (loss) $ (32,682) $ (8,128) $ (47,696)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 13,006 14,204 15,067
Amortization of assets subject to financing obligation 2,682 2,682 2,682
Goodwill and intangible asset impairment expense 1,164 0 0
Impairment of investment in unconsolidated affiliate 0 0 815
Bad debt expense 1,511 827 1,153
Stock-based compensation 1,815 2,945 4,904
Deferred income taxes (2,812) 0 27,928
Equity in earnings of unconsolidated affiliate (385) (484) (342)
Training equipment credits earned, net 33 (1,198) (1,176)
Other (gains) losses, net 122 (15) 429
Changes in assets and liabilities:      
Restricted cash (125) (11,126) 165
Receivables (2,695) (2,976) 8,202
Notes receivable 3,393 0 0
Prepaid expenses and other current assets (1,584) 692 (2,009)
Other assets (116) 84 (127)
Accounts payable and accrued expenses 3,858 (4,759) 1,855
Deferred revenue (5,663) (3,153) (202)
Income tax payable/receivable (812) 2,697 (3,394)
Accrued tool sets and other current liabilities 1,014 556 489
Deferred rent liability 5,116 (2,100) (1,835)
Other liabilities (318) (726) 476
Net cash provided by (used in) operating activities (13,478) (9,978) 7,384
Cash flows from investing activities:      
Purchase of property and equipment (20,606) (8,190) (7,495)
Proceeds from disposal of property and equipment 25 2 22
Purchase of held-to-maturity investments 0 (9,672) 0
Proceeds received upon maturity of investments 7,739 3,565 27,709
Purchase of trading securities (894) (42,696) 0
Proceeds from sale of trading securities 40,902 2,747 0
Acquisitions 0 0 (1,500)
Investment in joint venture 0 0 (1,000)
Capitalized costs for intangible assets (325) (575) (575)
Return of capital contribution from unconsolidated affiliate 291 390 475
Restricted cash: other 892 2,258 (289)
Net cash provided by (used in) investing activities 28,024 (52,171) 17,347
Cash flows from financing activities:      
Proceeds from sale of preferred stock, net of issuance costs paid 0 0 68,886
Payment of preferred stock dividend (5,250) (5,250) (1,424)
Payment of common stock dividends 0 0 1,457
Repayment of financing obligation (1,107) (913) (736)
Payment of payroll taxes on stock-based compensation through shares withheld (223) (595) (393)
Net cash provided by (used in) financing activities (6,580) (6,758) 64,876
Net increase (decrease) in cash and cash equivalents 7,966 (68,907) 89,607
Cash and cash equivalents, beginning of period 50,138 119,045 29,438
Cash and cash equivalents, end of period 58,104 50,138 119,045
Supplemental disclosure of cash flow information:      
Taxes paid 610 2,700 1,636
Interest paid 3,310 3,382 3,439
Training equipment obtained in exchange for services 3,240 1,897 2,738
Depreciation of training equipment obtained in exchange for services 1,386 1,283 1,342
Change in accrued capital expenditures during the period (1,042) (187) 1,792
Stock based compensation classified as liability instruments 0 0 175
Vesting of stock based compensation liability $ 0 $ 175 $ 78