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Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Current assets:      
Cash and cash equivalents $ 57,946 $ 59,547 $ 64,358
Receivables, net 903,831 873,986 920,824
Inventories 316,328 291,167 302,837
Current regulatory assets 109,581 68,527 60,557
Prepayments and other current assets 74,259 44,120 48,194
Total current assets 1,461,945 1,337,347 1,396,770
Noncurrent assets:      
Property, plant and equipment 8,417,559 8,300,770 8,063,435
Less accumulated depreciation, depletion and amortization 3,129,717 3,133,831 3,064,833
Net property, plant and equipment 5,287,842 5,166,939 4,998,602
Goodwill 717,863 714,963 708,664
Other intangible assets, net 23,401 25,496 31,515
Regulatory assets 376,913 379,381 351,025
Investments 173,157 165,022 154,779
Operating lease right-of-use assets 112,437 120,113 115,751
Other 144,653 144,111 154,026
Total noncurrent assets  6,836,266 6,716,025 6,514,362
Total assets 8,298,211 8,053,372 7,911,132
Current liabilities:      
Short-term borrowings 50,000 50,000 75,000
Long-term debt due within one year 1,549 1,555 16,560
Accounts payable 431,878 426,264 433,362
Taxes payable 78,805 88,844 80,882
Dividends payable 42,791 42,611 41,608
Accrued compensation 95,909 90,629 85,525
Regulatory liabilities due within one year 23,454 31,450 48,000
Operating lease liabilities due within one year 31,787 33,655 31,985
Other accrued liabilities 188,187 198,514 186,797
Total current liabilities  944,360 963,522 999,719
Noncurrent liabilities:      
Long-term debt 2,335,500 2,211,575 2,265,316
Deferred income taxes 538,633 516,098 516,760
Asset retirement obligations 450,620 440,356 422,169
Regulatory liabilities 428,467 428,075 438,652
Operating lease liabilities 81,052 86,868 84,302
Other 320,777 327,773 286,527
Total noncurrent liabilities  4,155,049 4,010,745 4,013,726
Commitments and contingencies
Stockholders' equity:      
Common stock 202,822 201,061 201,061
Other paid-in capital 1,422,169 1,371,385 1,363,182
Retained earnings 1,624,405 1,558,363 1,377,879
Accumulated other comprehensive loss (46,968) (48,078) (40,809)
Treasury stock at cost - 538,921 shares (3,626) (3,626) (3,626)
Total stockholders' equity 3,198,802 3,079,105 2,897,687
Total liabilities and stockholders' equity  $ 8,298,211 $ 8,053,372 $ 7,911,132
Common Stock, Shares Authorized 500,000,000 500,000,000 500,000,000
Common Stock, Par or Stated Value Per Share $ 1.00 $ 1.00 $ 1.00
Common Stock, Shares, Issued 202,822,301 201,061,198 201,061,198
Treasury Stock, Common, Shares 538,921 538,921 538,921