Discontinued Operations - Net Assets Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amounts of contingent liabilities remaining	$ 4,800		$ 4,800
Deferred acquisition costs	16,000
Gain from sale of discontinued operations	613	$ 0	613	$ 0
Gain from sale of discontinued operations, net of tax	399
Assets:
Due premiums	3,558		3,558		$ 8,041
Other receivables	237,656		237,656		287,765
Deferred acquisition costs	0		0		17,037
Total assets related to discontinued operations	241,214		241,214		312,843
Liabilities:
Unearned and advance premiums	2,750		2,750		806
Policy claims and other benefits payable	12,560		12,560		12,309
Risk sharing payable	23,837		23,837		23,837
Current and deferred income taxes payable	15,876		15,876		13,604
Other(2)	7,395		7,395		479
Total liabilities related to discontinued operations	62,418		62,418		51,035
Net assets	178,796		178,796		261,808
Centers for Medicare and Medicaid Services [Member]
Assets:
Other receivables	228,000		228,000		193,000
Drug Manufacturers [Member]
Assets:
Other receivables	$ 9,000		$ 9,000		$ 95,000