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Pension and Postretirement Benefits - Amounts Recognized in AOCI (Details) - Domestic Plans - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Pension Plans | Funded Plans
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	$ 8,643	$ 8,681
Subtotal	8,643	8,681
Less tax effect	(2,182)	(3,292)
Total	6,461	5,389
Pension Plans | Unfunded Pension Plans
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	2,055	2,587
Subtotal	2,055	2,587
Less tax effect	(519)	(981)
Total	1,536	1,606
Postretirement Benefit Plans
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	2,549	2,784
Prior service credit	(146)	(351)
Subtotal	2,403	2,433
Less tax effect	(607)	(923)
Total	1,796	1,510
US Postretirement and Pension Plan
Amounts recognized in accumulated other comprehensive income
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	13,247	14,052
Prior service credit	(146)	(351)
Subtotal	13,101	13,701
Less tax effect	(3,308)	(5,196)
Total	$ 9,793	$ 8,505

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- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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