Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property plant and equipment
Utility plant—at original cost, net of accumulated depreciation of $4,010,604 at September 30 and $3,894,326 at December 31	$ 12,668,123	$ 12,244,359
Nonutility property, net of accumulated depreciation of $239,780 at September 30 and $215,083 at December 31	131,235	143,995
Total property, plant and equipment	12,799,358	12,388,354
Current assets
Cash and cash equivalents	74,128	26,964
Restricted funds	20,040	28,505
Accounts receivable	284,273	241,926
Allowance for uncollectible accounts	(34,579)	(33,823)
Unbilled revenues	227,037	215,725
Income taxes receivable	9,608	5,778
Materials and supplies	37,203	32,973
Deferred income taxes	104,251	18,609
Assets of discontinued operations	6,256	7,761
Other	28,744	28,276
Total current assets	756,961	572,694
Regulatory and other long-term assets
Regulatory assets	874,828	858,465
Restricted funds	17,243	754
Goodwill	1,208,065	1,207,764
Other	59,192	60,998
Total regulatory and other long-term assets	2,159,328	2,127,981
TOTAL ASSETS	15,715,647	15,089,029
Capitalization
Common stock ($0.01 par value, 500,000 shares authorized, 179,265 shares outstanding at September 30 and 178,379 at December 31)	1,793	1,784
Paid-in-capital	6,297,187	6,261,396
Accumulated deficit	(1,333,164)	(1,495,698)
Accumulated other comprehensive loss	(35,942)	(34,635)
Treasury stock	(10,222)	(5,043)
Total common stockholders' equity	4,919,652	4,727,804
Long-term debt
Long-term debt	5,540,648	5,212,881
Redeemable preferred stock at redemption value	15,958	17,177
Total capitalization	10,476,258	9,957,862
Current liabilities
Short-term debt	313,979	630,307
Current portion of long-term debt	55,581	14,174
Accounts payable	260,713	264,115
Taxes accrued	46,945	32,166
Interest accrued	97,062	52,087
Liabilities of discontinued operations	1,667	3,824
Other	282,988	238,860
Total current liabilities	1,058,935	1,235,533
Regulatory and other long-term liabilities
Advances for construction	368,827	375,729
Deferred income taxes	2,118,499	1,841,584
Deferred investment tax credits	25,362	26,408
Regulatory liabilities	385,288	373,319
Accrued pension expense	90,026	108,542
Accrued postretirement benefit expense	88,338	88,419
Other	36,893	38,929
Total regulatory and other long-term liabilities	3,113,233	2,852,930
Contributions in aid of construction	1,067,221	1,042,704
Commitments and contingencies (See Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 15,715,647	$ 15,089,029