CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Utility plant:
Utility plant	$ 3,752,243	$ 3,550,485
Less accumulated depreciation and amortization	(1,214,427)	(1,144,115)
Net utility plant	2,537,816	2,406,370
Current assets:
Cash and cash equivalents	114,388	42,653
Receivables:
Customers, net	46,087	32,058
Regulatory balancing accounts	23,738	38,225
Other, net	13,605	14,187
Unbilled revenue, net	39,599	34,879
Materials and supplies at weighted average cost	8,375	7,745
Taxes, prepaid expenses, and other assets	21,097	14,965
Total current assets	266,889	184,712
Other assets:
Regulatory assets	440,986	433,322
Goodwill	31,132	2,615
Other assets	83,110	84,289
Total other assets	555,228	520,226
TOTAL ASSETS	3,359,933	3,111,308
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 49,398 and 48,532 outstanding in 2020 and 2019, respectively	494	485
Additional paid-in capital	400,080	362,275
Retained earnings	381,449	417,146
Total common stockholders’ equity	782,023	779,906
Long-term debt, net	785,257	786,754
Total capitalization	1,567,280	1,566,660
Current liabilities:
Current maturities of long-term debt, net	21,872	21,868
Short-term borrowings	375,100	175,100
Accounts payable	128,216	108,463
Regulatory balancing accounts	1,602	4,462
Accrued interest	5,330	5,810
Accrued expenses and other liabilities	45,432	43,018
Total current liabilities	577,552	358,721
Deferred income taxes	223,955	222,590
Pension and postretirement benefits other than pensions	261,119	258,907
Regulatory liabilities and other	270,177	271,831
Advances for construction	195,056	191,062
Contributions in aid of construction	264,794	241,537
Commitments and contingencies (Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 3,359,933	$ 3,111,308
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	68,000
Common stock, shares outstanding (in shares)	49,398