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Employee Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee Retirement Plans
Service cost	$ 128	$ 151	$ 231	$ 301
Interest cost	624	549	1,230	1,098
Expected return on plan assets	(625)	(646)	(1,251)	(1,292)
Net amortization and deferral	167	159	313	319
Net periodic pension cost	$ 294	$ 213	$ 523	$ 426

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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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