Discontinued Operations - Income from Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Benefits and expenses:
Income from discontinued operations	$ 13,826	$ 11,528	$ (5,417)	$ (9,130)	$ 13,089	$ 8,022	$ 1,228	$ (7,474)	$ 10,807	$ 14,865	[1],[2]	$ 21,267	[1],[2]
Income taxes paid									110,650	100,922		128,771
Medicare Part D [Member]
Revenue:
Health premium									260,657	373,280		302,592
Benefits and expenses:
Health policyholder benefits									213,114	315,816		250,080
Amortization of deferred acquisition costs									3,506	2,858		2,520
Commissions, premium taxes, and non-deferred acquisition expenses									20,909	26,613		14,027
Other operating expense									6,502	5,123		3,247
Total benefits and expenses									244,031	350,410		269,874
Income before income taxes for discontinued operations									16,626	22,870		32,718
Income taxes									(5,819)	(8,005)		(11,451)
Income from discontinued operations									10,807	14,865		21,267
Income taxes paid									$ 3,409
Discontinued Operations [Member] | Medicare Part D [Member]
Benefits and expenses:
Income taxes paid										$ 12,013		$ 10,320

[1] Certain balances were adjusted to give effect to discontinued operations and the adoption of new accounting guidance as described in Note 1- Significant Accounting Policies under the caption "Low-Income Housing Tax Credit Interests."

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