Discontinued Operations - Income from Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Revenue:
Health premium	$ (48)	$ 53,632	$ (343)	$ 165,105
Benefits and expenses:
Health policyholder benefits	(115)	33,331	3,817	146,683
Amortization of deferred acquisition costs	0	1,018	0	2,958
Commissions, premium taxes, and non-deferred acquisition expenses	53	3,352	783	12,253
Other operating expense	32	1,222	809	4,512
Total benefits and expenses	(30)	38,923	5,409	166,406
Income (loss) before income taxes for discontinued operations	(18)	14,709	(5,752)	(1,301)
Gain from sale of discontinued operations	0	613	0	613	$ 1,800
Income tax benefit (expense)	6	(5,363)	2,013	241
Income (loss) from discontinued operations	$ (12)	$ 9,959	$ (3,739)	$ (447)