CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
ASSETS
Property, plant and equipment	$ 12,217,648	$ 11,001,910
Construction in progress	349,725	299,394
Total property, plant and equipment and construction in progress	12,567,373	11,301,304
Less accumulated depreciation and amortization	2,196,226	2,042,122
Net property, plant and equipment	10,371,147	9,259,182
Current assets
Cash and cash equivalents	13,771	26,409
Accounts receivable, less allowance for doubtful accounts of $14,795 in 2018 and $10,865 in 2017	253,295	222,263
Gas stored underground	165,732	184,653
Other current assets	46,055	106,321
Total current assets	478,853	539,646
Goodwill	730,419	730,132
Deferred charges and other assets	294,018	220,636
Total assets	11,874,437	10,749,596
Shareholders’ equity
Common stock, no par value (stated at $.005 per share); 200,000,000 shares authorized; issued and outstanding: 2018 — 111,273,683 shares, 2017 — 106,104,634 shares	556	531
Additional paid-in capital	2,974,926	2,536,365
Accumulated other comprehensive loss	(83,647)	(105,254)
Retained earnings	1,878,116	1,467,024
Shareholders’ equity	4,769,951	3,898,666
Long-term debt	2,493,665	3,067,045
Total capitalization	7,263,616	6,965,711
Commitments and contingencies (See Note 11)
Current liabilities
Accounts payable and accrued liabilities	217,283	233,050
Other current liabilities	547,068	332,648
Short-term debt	575,780	447,745
Current maturities of long-term debt	575,000	0
Total current liabilities	1,915,131	1,013,443
Deferred income taxes	1,154,067	1,878,699
Regulatory excess deferred taxes (See Note 12)	739,670	0
Regulatory cost of removal obligation	466,405	485,420
Pension and postretirement liabilities	177,520	230,588
Deferred credits and other liabilities	158,028	175,735
Total shareholders' equity and liabilities	$ 11,874,437	$ 10,749,596