Schedule I - Condensed Financial Information of Registrant (Condensed Statements of 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
Revenues
Net investment income (loss)																	$ 55,494	$ 45,166	$ 69,613
Administrative service fees																	6,294	(1,725)	34,791
Total revenues	$ 4,036,400		$ 4,153,700		$ 4,163,600		$ 3,889,900		$ 3,758,400		$ 3,789,900		$ 3,421,400		$ 3,038,900		16,243,587	14,008,586	11,053,743
Expenses
General and administrative																	1,816,166	1,552,364	1,083,694
Depreciation and amortization																	22,533	29,786	38,589
Interest																	33,309	31,376	32,614
Asset Impairment							1,900		3,800		84,700						1,884	88,536	0
Total expenses																	15,788,943	13,808,794	10,783,790
Income (loss) from operations before income taxes	101,500	[1],[2]	153,300	[3],[4]	132,100	[5],[6]	67,700	[7],[8]	16,300	[9],[10]	22,700	[11],[12]	98,800	[13]	62,000	[14]	454,644	199,792	269,953
Income tax benefit																	(268,967)	(54,163)	(99,827)
Net income	$ 37,100	[1],[2]	$ 60,300	[3],[4]	$ 58,400	[5],[6]	$ 30,000	[7],[8]	$ 4,900	[9],[10]	$ (8,900)	[11],[12]	$ 120,900	[13],[15]	$ 28,800	[14]	185,677	145,629	170,126
Parent Company [Member]
Revenues
Net investment income (loss)																	(3,554)	(125)	1,316
Other Income																	27	8	229
Administrative service fees																	477,960	477,440	464,393
Total revenues																	474,433	477,323	465,938
Expenses
General and administrative																	556,666	524,751	431,354
Depreciation and amortization																	21,707	28,207	36,185
Interest																	33,309	31,376	33,589
Asset Impairment																	1,884	88,528	0
Total expenses																	613,566	672,862	501,128
Income (loss) from operations before income taxes																	(139,133)	(195,539)	(35,190)
Income tax benefit																	82,312	53,011	13,014
Equity in net income (loss) of subsidiaries																	242,498	288,157	192,302
Net income																	$ 185,677	$ 145,629	$ 170,126

[1] Includes $22.7 million in pretax expenses primarily related to the Cognizant Transaction.

[2] Includes $58.2 million amortization of deferred costs of health insurer's fee and $21.1 million in other ACA fees.

[3] Includes $21.7 million in pretax expenses primarily related to the Cognizant Transaction.

[4] Includes $58.4 million amortization of deferred costs of health insurer's fee and $22.2 million in other ACA fees.

[5] Includes $26.4 million in pretax expenses primarily related to the Cognizant Transaction.

[6] Includes $58.5 million amortization of deferred costs of health insurer's fee and $21.5 million in other ACA fees.

[7] Includes $1.9 million pretax asset impairment and $44.3 million in pretax expenses primarily related to the Cognizant Transaction.

[8] Includes $57.8 million amortization of deferred costs of health insurer's fee and $20.8 million in other ACA fees.

[9] Includes $3.8 million pretax asset impairment primarily related to our assets held for sale in connection with the Cognizant Transaction and $68.3 million in pretax expenses primarily related to the Cognizant Transaction.

[10] Includes $35.4 million amortization of deferred costs of health insurer's fee and $25.8 million in other ACA fees.

[11] Includes $31.9 million amortization of deferred costs of health insurer's fee and $26.6 million in other ACA fees.

[12] Includes $84.7 million pretax asset impairment related to our assets held for sale in connection with the Cognizant Transaction and $21.1 million in pretax expenses primarily related to the Cognizant transaction.

[13] Includes $37.8 million amortization of deferred costs of health insurer's fee and $22.5 million in other ACA fees.

[14] Includes $36.3 million amortization of deferred costs of health insurer's fee and $22.5 million in other ACA fees.

[15] Includes tax benefit of $72.6 million, net of adjustments, as a result of a loss on the stock of one of our subsidiaries.