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Comprehensive Income (Details 3) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amortization of defined benefit pension items
Prior service cost	[1]			$ (47)
Actuarial losses	[1]			523
Total before tax				476
Tax benefit				(124)
Net of tax		$ 116	$ 80	$ 352	$ 241
[1] These amounts were included in the net periodic pension cost. See Note 10 for additional details.

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