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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Operating Activities: |  |
Net income | $ 83,018 | $ 82,091
Non-cash items included in net income: |  |
Depreciation and amortization | 125,445 | 111,487
Deferred income tax provision and investment tax credits | (12,930) | 11,085
Power and natural gas cost deferrals, net | (19,326) | (21,826)
Amortization of debt expense | 1,042 | 1,571
Stock-based compensation expense | 3,646 | 2,280
Equity-related AFUDC | (3,614) | (3,346)
Pension and other postretirement benefit expense | 10,557 | 14,793
Other regulatory assets and liabilities and deferred debits and credits | 5,559 | 4,008
Change in decoupling regulatory deferral | 22,550 | 2,203
Realized and unrealized gain on assets and investments | (13,144) | (9,085)
Other | 4,749 | (332)
Contributions to defined benefit pension plan | (28,000) | (28,000)
Cash paid for settlement of interest rate swap agreements | (17,035) |
Changes in certain current assets and liabilities: |  |
Accounts and notes receivable | 33,206 | 26,284
Materials and supplies, fuel stock and stored natural gas | (21,058) | (15,328)
Collateral posted for derivative instruments | 18,131 | (24,102)
Income taxes receivable | (168) | 23,869
Other current assets | (1,294) | 2,505
Accounts payable | (13,530) | 8,111
Other current liabilities | 28,137 | 1,795
Net cash provided by operating activities | 205,941 | 190,063
Investing Activities: |  |
Utility property capital expenditures (excluding equity-related AFUDC) | (210,646) | (213,827)
Equity and property investments | (7,765) | (5,650)
Proceeds from sale of investments |  | 6,806
Other | (1,008) | 1,832
Net cash used in investing activities | (219,419) | (210,839)
Financing Activities: |  |
Net increase (decrease) in short-term borrowings | (126,000) | 93,000
Proceeds from issuance of long-term debt | 399,856 |
Maturity of long-term debt and finance leases | (251,543) | (1,491)
Issuance of common stock, net of issuance costs | 60,765 | 15,689
Cash dividends paid | (64,077) | (58,693)
Other | (6,072) | (2,898)
Net cash provided by financing activities | 12,929 | 45,607
Net increase (decrease) in cash and cash equivalents | (549) | 24,831
Cash and cash equivalents at beginning of period | 22,168 | 14,196
Cash and cash equivalents at end of period | $ 21,619 | $ 39,027

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