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Pension Benefits (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Components of net periodic benefit cost
Service cost	$ 409	$ 390	$ 818	$ 780
Interest cost	303	326	606	652
Expected return on plan assets	(711)	(631)	(1,422)	(1,262)
Recognized net actuarial loss	386	367	772	734
Net periodic pension cost	$ 387	$ 452	$ 774	$ 904

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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

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