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Pension Benefits (Details) - Defined Benefit Pension Items [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Components of net periodic benefit cost
Service cost	$ 368	$ 370	$ 1,104	$ 1,110
Interest cost	392	318	1,176	954
Expected return on plan assets	(756)	(699)	(2,268)	(2,097)
Special termination benefit liability	0	16	0	48
Recognized net actuarial loss	412	387	1,236	1,161
Net periodic pension cost	$ 416	$ 392	$ 1,248	$ 1,176

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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 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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