Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 10,314	$ 5,203
Restricted cash	1,190	3,046
Accounts receivable (less allowances for doubtful accounts of $9,760 and $4,052, respectively)	71,507	53,720
Accounts receivable — related parties	2,273	2,807
Accrued utility revenues	13,977	13,296
Inventories	52,413	53,309
Prepaid income taxes	53,857	7,711
Regulatory assets	7,475	8,338
Derivative instruments	3,004	1,354
Prepaid expenses	9,006	8,450
Other current assets	8,003	7,956
Total current assets	233,019	165,190
Property, plant and equipment	3,616,289	3,285,329
Less accumulated depreciation	(1,074,521)	(1,010,781)
Net property, plant and equipment	2,541,768	2,274,548
Goodwill	182,145	182,145
Regulatory assets	293,527	360,591
Other assets	16,117	11,541
Total assets	3,266,576	2,994,015
Current liabilities:
Current maturities of long-term debt	9,001	39,996
Short-term borrowings	189,500	170,000
Accounts payable — trade	87,861	71,559
Accounts payable — related parties	9,585	6,890
Employee compensation and benefits accrued	19,081	21,851
Interest accrued	15,716	16,200
Customer deposits and advances	36,363	35,278
Derivative instruments	0	1,071
Regulatory liabilities	40,131	12,988
Other current liabilities	43,096	37,649
Total current liabilities	450,334	413,482
Long-term debt	828,995	711,105
Deferred income taxes	400,939	635,465
Deferred investment tax credits	2,631	2,950
Pension and other postretirement benefit obligations	81,590	143,674
Regulatory liabilities	350,044	36,242
Other noncurrent liabilities	58,755	63,192
Total liabilities	2,173,288	2,006,110
Commitments and contingencies (Note 12)
Common stockholder’s equity:
Common Stock, $2.25 par value (authorized — 40,000,000 shares; issued and outstanding — 26,781,785 shares)	60,259	60,259
Additional paid-in capital	473,580	473,580
Retained earnings	579,778	480,857
Accumulated other comprehensive loss	(20,329)	(26,791)
Total common stockholder’s equity	1,093,288	987,905
Total liabilities and stockholder’s equity	$ 3,266,576	$ 2,994,015