Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains	$ (556)	$ 132	$ (241)	$ 397
Other-than-temporary impairment loss	0	0	(75)	0
Income (loss) from continuing operations before income tax (benefit) expense	(228)	(4,072)	2,248	(6,422)
Income tax (benefit) expense	168	190	(545)	444
(Loss) income from continuing operations	(396)	(4,262)	2,793	(6,866)
Income from discontinued operations, net of taxes	0	594	0	980
Net (loss) income	(396)	(10,296)	2,793	(12,514)
Unrealized Gains (Losses) on Available-for-Sale Investments | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains	(38)	5	(32)	8
Other-than-temporary impairment loss	0	0	0	0
Income (loss) from continuing operations before income tax (benefit) expense	(38)	5	(32)	8
Income tax (benefit) expense	0	0	0	0
(Loss) income from continuing operations	(38)	5	(32)	8
Income from discontinued operations, net of taxes	0	(1)	0	3
Net (loss) income	$ (38)	$ 4	$ (32)	$ 11