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Comprehensive Income (Details 3) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Amortization of defined benefit pension items
Prior service cost	[1]	$ (16)
Actuarial losses	[1]	175
Total before tax		159
Tax benefit		(41)
Net of tax		$ 118	$ 73
[1] These amounts were included in net periodic pension cost. See Note 8 for additional details.

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