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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Utility plant: |  |
Utility plant | $ 3,952,681 | $ 3,890,423
Less accumulated depreciation and amortization | (1,267,745) | (1,239,865)
Net utility plant | 2,684,936 | 2,650,558
Current assets: |  |
Cash and cash equivalents | 84,387 | 44,555
Receivables: |  |
Customers, net | 39,652 | 44,025
Regulatory balancing accounts | 97,820 | 96,241
Other, net | 19,470 | 20,331
Unbilled revenue, net | 33,945 | 34,069
Materials and supplies at weighted average cost | 9,201 | 8,831
Taxes, prepaid expenses, and other assets | 17,925 | 17,964
Total current assets | 302,400 | 266,016
Other assets: |  |
Regulatory assets | 328,336 | 325,376
Goodwill | 31,390 | 31,842
Other assets | 124,405 | 120,456
Total other assets | 484,131 | 477,674
TOTAL ASSETS | 3,471,467 | 3,394,248
Capitalization: |  |
Common stock, $0.01 par value; 68,000 shares authorized, 50,835 and 50,334 outstanding in 2021 and 2020, respectively | 508 | 503
Additional paid-in capital | 471,698 | 448,632
Retained earnings | 457,596 | 472,209
Total common stockholders’ equity | 929,802 | 921,344
Long-term debt, net | 780,951 | 781,100
Total capitalization | 1,710,753 | 1,702,444
Current liabilities: |  |
Current maturities of long-term debt, net | 5,136 | 5,127
Short-term borrowings | 435,000 | 370,000
Accounts payable | 120,549 | 131,725
Regulatory balancing accounts | 34,215 | 34,636
Accrued interest | 14,728 | 6,178
Accrued expenses and other liabilities | 45,838 | 41,040
Total current liabilities | 655,466 | 588,706
Deferred income taxes | 275,987 | 276,032
Pension and postretirement benefits other than pensions | 111,926 | 115,581
Regulatory liabilities and other | 251,851 | 247,810
Advances for construction | 197,715 | 195,625
Contributions in aid of construction | 267,769 | 268,050
Commitments and contingencies (Note 10) |  |
TOTAL CAPITALIZATION AND LIABILITIES | $ 3,471,467 | $ 3,394,248

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