Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost of Pension and Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Plans
Net periodic benefit cost:
Net periodic benefit cost	$ 310	$ 262	$ 682	$ 500
Total expenses	310	262	682	500
Postretirement Benefit Plans
Net periodic benefit cost:
Net periodic benefit cost	109	95	218	218
Total expenses	109	95	218	218
Domestic Plans | Pension Plans
Net periodic benefit cost:
Service cost	0	0	0	0
Interest cost	125	91	250	205
Expected return on plan assets	51	12	49	(15)
Amortization of prior service credit	0	0	0	0
Recognized net actuarial loss	134	159	268	310
Net periodic benefit cost	310	262	567	500
Settlement cost	0	0	115	0
Total expenses	310	262	567	500
Domestic Plans | Postretirement Benefit Plans
Net periodic benefit cost:
Service cost	10	15	20	28
Interest cost	54	40	108	95
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	22	(2)	44	(3)
Recognized net actuarial loss	23	42	46	98
Net periodic benefit cost	109	95	218	218
Settlement cost	0	0	0	0
Total expenses	109	95	218	218
Foreign Pension Plans
Net periodic benefit cost:
Service cost	76	117	161	230
Interest cost	79	80	167	156
Expected return on plan assets	(98)	(130)	(223)	(255)
Amortization of prior service credit	0	0	0	0
Recognized net actuarial loss	36	50	71	99
Net periodic benefit cost	93	117	176	230
Settlement cost	0	0	533	0
Total expenses	93	117	176	230
Foreign Pension Plans | Pension Plans
Net periodic benefit cost:
Net periodic benefit cost	93	117	709	230
Total expenses	$ 93	$ 117	$ 709	$ 230