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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Non cash net unrealized loss (gain) on investments, net of deferred tax benefit (provision)	$ 377	$ (2,145)	$ (134)
Adjustments to postretirement benefits obligation, net of deferred tax (provision) benefit	$ (9)	$ (24)	$ 0

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- Definition

Adjustments To Postretirement Benefits Obligation, Net Of Deferred Tax Benefit Provision

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- Definition

The amount of deferred tax provision resulting from unrealized gains and losses during the period.

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