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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 10,633	$ 5,927	$ 21,726	$ 16,067
Other comprehensive income, before tax:
Amortization of unrecognized loss	0	2	0	6
Unrealized (losses) gains on investments arising during the period	(618)	1,879	(2,536)	4,941
Reclassification adjustment for sales of securities included in net income	0	(804)	0	(977)
Other comprehensive (loss) income, before tax	(618)	1,077	(2,536)	3,970
Income tax expense related to postretirement health benefits	0	1	0	2
Income tax (benefit) expense related to unrealized (losses) gains on investments arising during the period	(131)	643	(537)	1,688
Income tax benefit related to reclassification adjustment for sales of securities included in net income	0	(274)	0	(334)
Net income tax (benefit) expense on other comprehensive (loss) income	(131)	370	(537)	1,356
Other comprehensive (loss) income	(487)	707	(1,999)	2,614
Comprehensive Income	10,146	6,634	19,727	18,681
Comprehensive loss attributable to noncontrolling interests	1	0	31	11
Comprehensive Income Attributable to the Company	$ 10,147	$ 6,634	$ 19,758	$ 18,692

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