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Condensed Consolidated Balance Sheets (unaudited)  (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Assets    
Property, plant and equipment, accumulated depreciation $ 3,444,195 $ 3,378,282
Shareholders’ equity    
Preferred stock, no par value (in dollars per share) $ 0 $ 0
Preferred stock, authorized shares (in shares) 10,000,000 10,000,000
Preferred stock, issued shares (in shares) 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, authorized shares (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 172,611,853 172,465,608
Common stock, shares outstanding (in shares) 172,611,853 172,465,608