Discontinued Operations - Net Assets Held For Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Total assets related to discontinued operations	$ 68,520	$ 127,532
Liabilities:
Total liabilities related to discontinued operations	49,854	27,424
Amounts of contingent liabilities remaining		3,600
Medicare Part D
Assets:
Due premiums	3,945	8,840
Other receivables	64,575	118,692
Total assets related to discontinued operations	68,520	127,532
Liabilities:
Risk sharing payable	8,731	8,374
Current and deferred income taxes payable	1,077	3,820
Other	40,046	15,230
Total liabilities related to discontinued operations	49,854	27,424
Net assets	18,666	100,108
Centers for Medicare and Medicaid Services
Liabilities:
Amount payable to CSM	37,300
Centers for Medicare and Medicaid Services | Medicare Part D
Assets:
Other receivables	$ 65,000	50,000
Drug Manufacturers | Medicare Part D
Assets:
Other receivables		$ 69,000