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Employee Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 151	$ 142	$ 301	$ 282
Interest cost	549	555	1,098	1,103
Expected return on plan assets	(646)	(609)	(1,292)	(1,151)
Net amortization and deferral	159	143	319	263
Net periodic pension cost	$ 213	$ 231	$ 426	$ 497

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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.

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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 net periodic benefit cost (credit) for 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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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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