Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 68,855	$ 103,311
Marketable securities	0	19,921
Restricted cash	3,646	3,823
Receivables, net	23,080	14,290
Expendable parts and supplies, net	21,337	15,658
Prepaid expenses and other current assets	40,923	40,914
Total current assets	157,841	197,917
Property and equipment, net	1,273,585	1,250,829
Intangibles, net	9,532	11,341
Lease and equipment deposits	2,167	2,598
Other assets	8,792	9,703
Total assets	1,451,917	1,472,388
Current liabilities:
Current portion of long-term debt and capital leases	165,900	155,170
Accounts payable ($1,729 and $1,330 to related party)	49,930	54,307
Accrued compensation	11,988	12,208
Other accrued expenses	28,888	29,696
Total current liabilities	256,706	251,381
Long-term debt and capital leases, excluding current portion	677,423	760,177
Deferred credits ($5,751 and $7,702 to related party)	12,134	15,393
Deferred income taxes	55,303	39,797
Other noncurrent liabilities	24,483	31,173
Total noncurrent liabilities	769,343	846,540
Total liabilities	1,026,049	1,097,921
Commitments and contingencies (Note 15 and Note 16)
Stockholders' equity:
Preferred stock of no par value, 5,000,000 shares authorized; no shares issued and outstanding
Common stock of no par value and additional paid-in capital, 125,000,000 shares authorized; 31,413,287 (2019) and 23,902,903 (2018) shares issued and outstanding, and 3,600,953 (2019) and 10,614,990 (2018) warrants issued and outstanding	238,504	234,683
Retained earnings	187,364	139,784
Total stockholders' equity	425,868	374,467
Total liabilities and stockholders' equity	$ 1,451,917	$ 1,472,388