Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Utility plant:
Electric plant in service	$ 4,018,380	$ 3,982,095
Less accumulated depreciation and amortization	(1,332,076)	(1,320,175)
Net plant in service	2,686,304	2,661,920
Construction work in progress	165,608	146,059
Nuclear fuel; includes fuel in process of $69,533 and $59,689, respectively	204,778	194,933
Net nuclear fuel	120,549	120,458
Net utility plant	2,972,461	2,928,437
Current assets:
Cash and cash equivalents	2,574	6,990
Accounts receivable, principally trade, net of allowance for doubtful accounts of $1,820 and $2,300, respectively	76,681	88,585
Inventories, at cost	49,919	50,910
Prepayments and other	10,781	10,307
Total current assets	139,955	156,792
Deferred charges and other assets:
Decommissioning trust funds	284,082	286,866
Regulatory assets	92,619	96,036
Other	16,503	16,232
Total deferred charges and other assets	393,204	399,134
Total assets	3,505,620	3,484,363
Capitalization:
Common stock, stated value $1 per share, 100,000,000 shares authorized, 65,666,420 and 65,694,829 shares issued, and 162,268 and 133,859 restricted shares, respectively	65,829	65,829
Capital in excess of stated value	325,227	326,117
Retained earnings	1,180,114	1,159,667
Accumulated other comprehensive income (loss), net of tax	(32,321)	11,058
Total stockholders' equity subtotal before treasury stock	1,538,849	1,562,671
Treasury stock, 25,166,943 and 25,244,350 shares, respectively, at cost	(419,216)	(420,506)
Common stock equity	1,119,633	1,142,165
Long-term debt, net of current portion	1,196,110	1,195,988
Total capitalization	2,315,743	2,338,153
Current liabilities:
Short-term borrowings under the revolving credit facility	233,067	173,533
Accounts payable, principally trade	35,838	59,270
Taxes accrued	26,478	35,660
Interest accrued	19,060	12,470
Over-collection of fuel revenues	14,190	6,225
Other	35,764	29,067
Total current liabilities	364,397	316,225
Deferred credits and other liabilities:
Accumulated deferred income taxes	298,440	305,023
Accrued pension liability	81,576	83,838
Accrued post-retirement benefit liability	26,957	26,417
Asset retirement obligation	95,098	93,029
Regulatory liabilities	298,035	296,685
Other	25,374	24,993
Total deferred credits and other liabilities	825,480	829,985
Commitments and contingencies
Total capitalization and liabilities	3,505,620	3,484,363
Nuclear Fuel
Utility plant:
Less accumulated depreciation and amortization	$ (84,229)	$ (74,475)