Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets
Property, plant and equipment, accumulated depreciation	$ 3,292,930	$ 3,192,545
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)	109,611,599	109,470,795
Common stock, shares outstanding (in shares)	109,611,599	109,470,795