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Employee Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 103	$ 151
Interest cost	606	549
Expected return on plan assets	(626)	(646)
Net amortization and deferral	146	159
Net periodic pension cost	$ 229	$ 213

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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

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Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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The gain/loss and prior service cost amounts that were amortized and recognized as part of defined benefit pension cost during the year.

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