Pensions - Schedule of Benefit Obligations and Plan Assets Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Benefit Obligations
Balance as of January 1	$ 636,497	$ 643,961
Interest cost	10,469	13,949	$ 22,146
Actuarial (gain) loss, net	(12,565)	63,164
Benefits paid	(42,434)	(66,746)
Annuity purchase	0	(17,831)
Balance as of December 31	591,967	636,497	643,961
Change in Plan Assets
Balance as of January 1	444,228	449,019
Plan contributions	36,185	44,908
Actual return on plan assets, net of administrative expenses	12,734	34,878
Benefits paid	(42,434)	(66,746)
Annuity purchase	0	(17,831)
Balance as of December 31	450,713	444,228	$ 449,019
Funded Status as of December 31 (plan assets less benefit obligations)	$ (141,254)	$ (192,269)