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Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost of Pension and Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Domestic Plans | Pension Plans
Net periodic benefit cost:
Service cost	$ 15	$ 13	$ 46	$ 48
Interest cost	209	198	646	585
Expected return on plan assets	(35)	(65)	(74)	(145)
Recognized net actuarial loss	96	124	302	370
Net periodic benefit cost	285	270	920	858
Domestic Plans | Postretirement Benefit Plans
Net periodic benefit cost:
Service cost	13	4	48	60
Interest cost	93	129	343	337
Amortization of prior service credit	(47)	(51)	(141)	(154)
Recognized net actuarial loss	(43)	187	84	304
Net periodic benefit cost	16	269	334	547
Foreign Pension Plans
Net periodic benefit cost:
Service cost	101	138	303	418
Interest cost	92	91	281	273
Expected return on plan assets	(122)	(126)	(364)	(382)
Recognized net actuarial loss	37	38	111	120
Net periodic benefit cost	$ 108	$ 141	$ 331	$ 429

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

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- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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No definition available.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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