Discontinued Operations - Net Assets Held For Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Total assets held for sale	$ 312,843	$ 288,045	[1]
Liabilities:
Total liabilities held for sale	51,035	38,876	[1]
Medicare Part D [Member]
Assets:
Due premiums	8,041	5,292
Risk sharing receivable	0	31,373
Other receivables	287,765	236,996
Deferred acquisition costs	17,037	14,384
Total assets held for sale	312,843	288,045
Liabilities:
Unearned and advance premiums	806	572
Policy claims and other benefits payable(2)	12,309	15,517
Risk sharing payable	23,837	0
Current and deferred income taxes payable	13,604	11,195
Other	479	11,592
Total liabilities held for sale	51,035	38,876
Net assets	261,808	249,169
Centers for Medicare and Medicaid Services [Member] | Medicare Part D [Member]
Assets:
Other receivables	193,000	179,000
Drug Manufacturers [Member] | Medicare Part D [Member]
Assets:
Other receivables	$ 95,000	$ 58,000

[1] Certain balances were adjusted to give effect to discontinued operations as described in Note 1—Significant Accounting Policies.