Significant Accounting Policies Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Customer advances	$ 123,249	$ 107,470
Pension and other employee benefits	56,603	75,302
AROs	37,725	39,255
Future QF obligation, net	23,498	28,670
Environmental	20,350	21,135
Other (none of which is individually significant)	54,619	60,540
Total Noncurrent Liabilities	$ 316,044	$ 332,372