Pension and Other Postretirement Benefits - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Changes in accumulated other comprehensive loss:
Net actuarial loss (gain), beginning of year	$ 80,671
Amortization of actuarial gain (loss)	(3,764)
Actuarial gain	(19,778)
Asset gain	(16,130)
Settlement gain recognized	18	$ 3,200
Other adjustments	191
Currency impact	(1,213)
Net actuarial loss (gain), end of year	39,995	80,671
Prior service cost, beginning of year	2,798
Amortization of prior service cost	(110)	(190)	$ (169)
Currency impact	(27)
Prior service cost, end of year	2,661	2,798
Other Benefits
Changes in accumulated other comprehensive loss:
Net actuarial loss (gain), beginning of year	(436)
Amortization of actuarial gain (loss)	43
Actuarial gain	(1,391)
Asset gain	0
Settlement gain recognized	0
Other adjustments	0
Currency impact	14
Net actuarial loss (gain), end of year	(1,770)	(436)
Prior service cost, beginning of year	0
Amortization of prior service cost	0	0	$ 0
Currency impact	0
Prior service cost, end of year	$ 0	$ 0