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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities:    
Net income $ 176,936 $ 162,267
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation, depletion and amortization 174,871 169,413
Deferred financing cost amortization 3,892 5,523
Impairment of investment 0 6,859
Stock compensation 7,245 2,696
Deferred income taxes 5,844 28,502
Employee benefit plans 6,779 9,294
Other adjustments, net 2,708 7,910
Changes in certain operating assets and liabilities:    
Materials, supplies and fuel (29,948) (10,905)
Accounts receivable and other current assets 97,348 75,960
Accounts payable and other current liabilities (20,094) (11,136)
Regulatory assets (559,389) 1,954
Regulatory liabilities (9,533) (17,686)
Contributions to defined benefit pension plans 0 (12,700)
Other operating activities, net (1,419) 1,508
Net cash provided by (used in) operating activities (144,760) 419,459
Investing activities:    
Property, plant and equipment additions (497,849) (535,993)
Other investing activities 13,743 6,269
Net cash (used in) investing activities (484,106) (529,724)
Financing activities:    
Dividends paid on common stock (106,957) (99,999)
Common stock issued 62,977 99,316
Term loan - borrowings 800,000 0
Term loan - repayments (800,000) 0
Net borrowings (payments) of Revolving Credit Facility and CP Program 98,485 (265,180)
Long-term debt - issuances 600,000 400,000
Long-term debt - repayments (8,436) (7,163)
Distributions to non-controlling interest (10,230) (12,636)
Other financing activities (2,778) (6,519)
Net cash provided by financing activities 633,061 107,819
Net change in cash, restricted cash and cash equivalents 4,195 (2,446)
Cash, restricted cash and cash equivalents at beginning of period 10,739 13,658
Cash, restricted cash and cash equivalents at end of period 14,934 11,212
Supplemental cash flow information:    
Interest, net of amounts capitalized (93,325) (87,453)
Income taxes 1,486 1,256
Accrued property, plant and equipment purchases at September 30 $ 55,619 $ 86,474