Details of Selected Consolidated Balance Sheet Captions

The following tables provide additional information regarding the composition of certain of our balance sheet captions.

Accounts receivable

Accounts receivable was comprised of the following at September 30, 2014 and 2013:



	September 30
	2014			2013
	(In thousands)
Billed accounts receivable	$	262,937		$	230,712
Unbilled revenue	62,484			58,710
Other accounts receivable	41,971			33,194
Total accounts receivable	367,392			322,616
Less: allowance for doubtful accounts	(23,992		)	(20,624		)
Net accounts receivable	$	343,400		$	301,992

Other current assets

Other current assets as of September 30, 2014 and 2013 were comprised of the following accounts.



	September 30
	2014		2013
	(In thousands)
Assets from risk management activities	$	45,827	$	11,966
Deferred gas costs	20,069		15,152
Taxes receivable	5,481		3,141
Prepaid expenses	25,039		21,666
Materials and supplies	5,704		5,511
Other	9,145		6,765
Total	$	111,265	$	64,201

Property, plant and equipment

Property, plant and equipment was comprised of the following as of September 30, 2014 and 2013:



	September 30
	2014			2013
	(In thousands)
Production plant	$	4,821		$	5,020
Storage plant	275,579			262,246
Transmission plant	1,622,846			1,362,662
Distribution plant	5,522,794			5,061,711
General plant	735,223			716,189
Intangible plant	38,858			38,444
	8,200,121			7,446,272
Construction in progress	247,579			275,747
	8,447,700			7,722,019
Less: accumulated depreciation and amortization	(1,721,794		)	(1,691,364		)
Net property, plant and equipment⁽¹⁾	$	6,725,906		$	6,030,655


⁽¹⁾	Net property, plant and equipment includes plant acquisition adjustments of $(76.4) million and $(83.8) million at September 30, 2014 and 2013.

Goodwill

The following presents our goodwill balance allocated by segment and changes in the balance for the fiscal year ended September 30, 2014:



	Regulated Distribution		Regulated Pipeline		Nonregulated		Total
	(In thousands)
Balance as of September 30, 2013	$	574,190	$	132,462	$	34,711	$	741,363
Deferred tax adjustments on prior acquisitions⁽¹⁾	626		40		—		666
Balance as of September 30, 2014	$	574,816	$	132,502	$	34,711	$	742,029


⁽¹⁾	We annually adjust certain deferred taxes recorded in connection with acquisitions completed in fiscal 2001 and fiscal 2004, which resulted in an increase to goodwill and net deferred tax liabilities of $0.7 million for fiscal 2014.

Deferred charges and other assets

Deferred charges and other assets as of September 30, 2014 and 2013 were comprised of the following accounts.



	September 30
	2014		2013
	(In thousands)
Marketable securities	$	79,613	$	72,682
Regulatory assets	230,240		273,287
Deferred financing costs	13,698		15,199
Assets from risk management activities	13,038		109,354
Other	14,340		14,595
Total	$	350,929	$	485,117

Accounts payable and accrued liabilities

Accounts payable and accrued liabilities as of September 30, 2014 and 2013 were comprised of the following accounts.

Other current liabilities

Other current liabilities as of September 30, 2014 and 2013 were comprised of the following accounts.



	September 30
	2014		2013
	(In thousands)
Customer credit balances and deposits	$	82,085	$	76,313
Accrued employee costs	46,445		54,034
Deferred gas costs	35,063		16,481
Accrued interest	36,768		36,744
Liabilities from risk management activities	1,730		1,543
Taxes payable	77,601		66,960
Pension and postretirement obligations	11,380		22,940
Current deferred tax liability	48,751		14,697
Regulatory cost of removal accrual	45,061		68,225
Other	17,467		10,954
Total	$	402,351	$	368,891

Deferred credits and other liabilities

Deferred credits and other liabilities as of September 30, 2014 and 2013 were comprised of the following accounts.



	September 30
	2014		2013
	(In thousands)
Customer advances for construction	$	9,883	$	11,723
Regulatory liabilities	4,472		1,123
Asset retirement obligation	10,508		6,764
Liabilities from risk management activities	20,126		—
Other	23,881		17,953
Total	$	68,870	$	37,563