Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ (15,301)	$ (7,952)	$ (22,785)	$ (20,078)
Other comprehensive income, before tax:
Accumulated postretirement benefit obligation adjustment	0	0	(41)	0
Net unrealized gain on investments arising during the period	61	431	1,093	2,847
Reclassification adjustment for sale of securities included in net income	0	0	(30)	0
Reclassification adjustment for write-down of securities included in net income	0	0	482	0
Other comprehensive income, before tax	61	431	1,504	2,847
Income tax benefit related to postretirement health benefits	0	0	(9)	0
Income tax expense related to net unrealized gain on investments arising during the period	11	90	229	601
Income tax benefit related to reclassification adjustment for sale of securities included in net income	0	0	(6)	0
Income tax expense related to reclassification adjustment for write-down of securities included in net income	0	0	110	0
Net income tax expense on other comprehensive income	11	90	324	601
Other comprehensive income	50	341	1,180	2,246
Comprehensive Income	$ 15,351	$ 8,293	$ 23,965	$ 22,324