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Comprehensive Income (Details 3) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortization of defined benefit pension items
Prior service cost	[1]			$ (31)
Actuarial losses	[1]			350
Total before tax				319
Tax benefit				(83)
Net of tax		$ 118	$ 88	$ 236	$ 161
[1] These amounts were included in net periodic pension cost. See Note 9 for additional details.

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