CONDENSED CONSOLIDATED BALANCE SHEETS Unaudited - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Utility plant:
Utility plant	$ 3,281,149	$ 3,229,446
Less accumulated depreciation and amortization	(1,021,590)	(996,723)
Net utility plant	2,259,559	2,232,723
Current assets:
Cash and cash equivalents	60,234	47,176
Receivables:
Customers	27,552	30,037
Regulatory balancing accounts	37,130	42,394
Other	19,460	17,101
Unbilled revenue	24,675	33,427
Materials and supplies at weighted average cost	6,444	6,586
Taxes, prepaid expenses, and other assets	17,230	11,981
Total current assets	192,725	188,702
Other assets:
Regulatory assets	366,921	353,569
Goodwill	2,615	2,615
Other assets	78,842	60,095
Total other assets	448,378	416,279
TOTAL ASSETS	2,900,662	2,837,704
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 48,134 and 48,065 outstanding in 2019 and 2018, respectively	481	481
Additional paid-in capital	338,728	337,623
Retained earnings	374,920	392,053
Total common stockholders’ equity	714,129	730,157
Long-term debt, net	710,602	710,027
Total capitalization	1,424,731	1,440,184
Current liabilities:
Current maturities of long-term debt, net	105,010	104,911
Short-term borrowings	125,100	65,100
Accounts payable	83,280	95,580
Regulatory balancing accounts	19,984	12,213
Accrued interest	12,181	5,674
Accrued expenses and other liabilities	38,488	37,688
Total current liabilities	384,043	321,166
Unamortized investment tax credits	1,649	1,649
Deferred income taxes	211,382	213,033
Pension and postretirement benefits other than pensions	200,953	193,538
Regulatory liabilities and other	264,555	256,522
Advances for construction	186,877	186,342
Contributions in aid of construction	226,472	225,270
Commitments and contingencies (Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 2,900,662	$ 2,837,704