Significant Accounting Policies Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Pension and other employee benefits	$ 84,731	$ 96,151
Customer advances	95,393	80,780
Future QF obligation, net	49,728	64,943
Asset retirement obligations	39,096	38,350
Environmental	22,662	23,395
Other (none of which is individually significant)	63,793	65,700
Total Noncurrent Liabilities	$ 355,403	$ 369,319