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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Activities: |  |  |
Net Income | $ 261,893 | $ 259,560 | $ 245,872
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 199,908 | 173,555 | 179,444
Deferred income taxes and investment tax credits | 39,613 | (511) | 23,901
Changes in regulatory assets and liabilities | (4,748) | (79,693) | (33,705)
Pension and postretirement benefit plan expense | 27,155 | 29,286 | 33,817
Contributions to pension and postretirement benefit plans | (55,337) | (44,192) | (44,220)
Earnings of unconsolidated equity-method investments | 12,426 | 11,511 | 11,435
Distributions from unconsolidated equity-method investments | 2,950 | 11,586 | 11,711
Allowance for equity funds used during construction | (43,221) | (37,285) | (31,537)
Other non-cash adjustments to net income, net | 8,414 | 14,892 | 8,929
Change in: |  |  |
Accounts receivable | (17,628) | (81,545) | (9,434)
Accounts payable and other accrued liabilities | (3,220) | (2,156) | (6,581)
Taxes accrued/receivable | (53,243) | (11,626) | 991
Other current assets | (81,244) | 112,602 | 17,700
Other current liabilities | (12,551) | (4,628) | (17,885)
Other assets | 10,712 | 22,951 | (4,304)
Net cash provided by operating activities | 267,027 | 351,285 | 363,264
Investing Activities: |  |  |
Additions to property, plant and equipment | (611,137) | (432,589) | (299,999)
Payments received from transmission project joint funding partners | 26,501 | 17,778 | 5,876
Payments to Acquire Partners Interest in Real Estate Partnership, Net of Cash Acquired | (2,533) | (9,881) | (15,148)
Proceeds from Equity Method Investment, Distribution, Return of Capital | 0 | 8,489 | 14,439
Payments to Acquire Equity Securities, FV-NI | (12,235) | (45,572) | (17,186)
Debt Securities, Held-to-Maturity, Purchase | (1,617) | (31,224) | 0
Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment | 8,921 | 63,857 | 11,328
Payments to Acquire Short-term Investments | 0 | 25,000 | 25,000
Proceeds from Maturities, Prepayments and Calls of Short-term Investments | 0 | 25,000 | 50,000
Other | 2,153 | 4,875 | 2,037
Net cash used in investing activities | (589,947) | (424,267) | (273,653)
Financing Activities: |  |  |
Issuance of long-term debt | 872,000 | 198,000 | 0
Premium on issuance of long-term debt [Abstract] | (7,006) | 0 | 0
Retirement of long-term debt | (225,000) | (4,360) | 0
Dividends on common stock | (163,545) | (154,287) | (146,119)
Acquisition of treasury stock | (3,274) | (3,111) | (3,031)
Other | (403) | (926) | (334)
Net cash used in financing activities | 472,772 | 35,316 | (149,484)
Net increase (decrease) in cash and cash equivalents | 149,852 | (37,666) | (59,873)
Cash and cash equivalents at beginning of the year | 177,577 | 215,243 | 275,116
Cash and cash equivalents at end of the year | 327,429 | 177,577 | 215,243
Cash paid during the period for: |  |  |
Income taxes | 6,200 | 45,885 | 34,330
Interest (net of amount capitalized) | 97,742 | 85,985 | 83,499
Non-cash investing activities: |  |  |
Additions to property, plant and equipment in accounts payable | $ 185,400 | $ 84,324 | $ 53,690

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