Pension and Other Postretirement Benefits - Change in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Change in plan assets:
Fair value of plan assets, beginning of year	$ 361,802
Fair value of plan assets, end of year	394,026	$ 361,802
Pension Benefits
Change in plan assets:
Fair value of plan assets, beginning of year	361,802	355,726
Actual return on plan assets	32,467	32,470
Employer contributions	11,618	6,393
Plan participant contributions	143	73
Acquisitions and divestitures	9,339	0
Settlements	(5,790)	(26,945)
Foreign currency exchange rate changes	(2,827)	7,803
Benefits paid	(12,726)	(13,718)
Fair value of plan assets, end of year	394,026	361,802
Other Benefits
Change in plan assets:
Fair value of plan assets, beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	1,469	1,351
Plan participant contributions	4	5
Acquisitions and divestitures	0	0
Settlements	0	0
Foreign currency exchange rate changes	0	0
Benefits paid	(1,473)	(1,356)
Fair value of plan assets, end of year	$ 0	$ 0