CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Utility plant:
Utility plant	$ 3,616,418	$ 3,550,485
Less accumulated depreciation and amortization	(1,169,447)	(1,144,115)
Net utility plant	2,446,971	2,406,370
Current assets:
Cash and cash equivalents	140,406	42,653
Receivables:
Customers, net	32,729	32,058
Regulatory balancing accounts	24,970	38,225
Other, net	14,428	14,187
Unbilled revenue, net	31,149	34,879
Materials and supplies at weighted average cost	8,135	7,745
Taxes, prepaid expenses, and other assets	18,265	14,965
Total current assets	270,082	184,712
Other assets:
Regulatory assets	442,819	433,322
Goodwill	2,615	2,615
Other assets	78,358	84,289
Total other assets	523,792	520,226
TOTAL ASSETS	3,240,845	3,111,308
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 48,714 and 48,532 outstanding in 2020 and 2019, respectively	487	485
Additional paid-in capital	368,129	362,275
Retained earnings	386,524	417,146
Total common stockholders’ equity	755,140	779,906
Long-term debt, net	786,467	786,754
Total capitalization	1,541,607	1,566,660
Current liabilities:
Current maturities of long-term debt, net	21,864	21,868
Short-term borrowings	335,100	175,100
Accounts payable	99,019	108,463
Regulatory balancing accounts	3,474	4,462
Accrued interest	14,545	5,810
Accrued expenses and other liabilities	39,125	43,018
Total current liabilities	513,127	358,721
Unamortized investment tax credits	1,575	1,575
Deferred income taxes	218,451	222,590
Pension and postretirement benefits other than pensions	260,337	258,907
Regulatory liabilities and other	268,917	270,256
Advances for construction	194,046	191,062
Contributions in aid of construction	242,785	241,537
Commitments and contingencies (Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 3,240,845	$ 3,111,308