BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Utility plant:
Electric plant in service	$ 3,791,566	$ 3,616,301
Less accumulated depreciation and amortization	(1,244,332)	(1,329,843)
Net plant in service	2,547,234	2,286,458
Construction work in progress	154,738	293,796
Nuclear fuel; includes fuel in process of $57,315 and $51,854, respectively	194,842	190,282
Less accumulated amortization	(75,602)	(75,031)
Net nuclear fuel	119,240	115,251
Net utility plant	2,821,212	2,695,505
Current assets:
Cash and cash equivalents	8,420	8,149
Accounts receivable, principally trade, net of allowance for doubtful accounts of $2,156 and $2,046, respectively	88,452	66,326
Inventories, at cost	47,216	48,697
Under-collection of fuel revenues	11,123	0
Prepayments and other	8,988	9,872
Total current assets	164,199	133,044
Deferred charges and other assets:
Decommissioning trust funds	255,708	239,035
Regulatory assets	118,861	115,127
Other	16,298	17,896
Total deferred charges and other assets	390,867	372,058
Total assets	3,376,278	3,200,607
Capitalization:
Common stock, stated value $1 per share, 100,000,000 shares authorized, 65,685,615 and 65,709,819 shares issued, and 137,017 and 118,834 restricted shares, respectively	65,823	65,829
Capital in excess of stated value	322,643	320,073
Retained earnings	1,114,561	1,067,396
Accumulated other comprehensive loss, net of tax	(7,116)	(13,914)
Total stockholders' equity subtotal before treasury stock	1,495,911	1,439,384
Treasury stock, 25,304,914 and 25,384,834 shares, respectively, at cost	(421,515)	(422,846)
Common stock equity	1,074,396	1,016,538
Long-term debt, net of current portion	1,195,513	1,122,660	[1]
Total capitalization	2,269,909	2,139,198
Current liabilities:
Current maturities of long-term debt	83,143	0	[1]
Short-term borrowings under the revolving credit facility	81,574	141,738	[1]
Accounts payable, principally trade	62,953	59,978
Taxes accrued	32,488	30,351
Interest accrued	13,287	12,649
Over-collection of fuel revenues	255	4,023
Other	29,709	28,325
Total current liabilities	303,409	277,064
Deferred credits and other liabilities:
Accumulated deferred income taxes	555,066	495,237
Accrued pension liability	92,768	90,527
Accrued postretirement benefit liability	34,400	54,553
Asset retirement obligation	81,800	81,621
Regulatory liabilities	18,435	24,303
Other	20,491	38,104
Total deferred credits and other liabilities	802,960	784,345
Commitments and contingencies
Total capitalization and liabilities	$ 3,376,278	$ 3,200,607

[1] The Company implemented ASU 2015-03, Interest - Imputation of Interest, which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. ASU 2015-03 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The impact of ASU 2015-03 on the Company's Balance Sheet was to reclassify $11.6 million of other deferred charges to long-term debt, net of current portion at December 31, 2015.