Condensed Consolidated Balance Sheets (unaudited)  (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets
Property, plant and equipment, accumulated depreciation	$ 3,497,615	$ 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)	400,000,000	400,000,000
Common stock, shares issued (in shares)	172,620,476	172,465,608
Common stock, shares outstanding (in shares)	172,620,476	172,465,608