Summary Of Significant Accounting Policies (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
Accounting Policies [Line Items]
Decrease in net income related to correction of errors	$ (65,744)	$ 7,022	$ (32,789)	$ (50,044)	$ (49,755)	$ (140,297)	$ (143,610)	$ (137,245)	$ (141,555)	$ (470,907)	$ (488,907)
Other comprehensive income (loss)									$ (437,218)	128,937	$ (403,573)
Percentage of market price									80.00%
Finite-lived intangible asset impairment charge									$ 0	0
Indefinite-lived intangible asset impairment charge									0	0
Increase in deferred gain on disposal of business									$ 0	12,777
Allowance against recorded receivables									100.00%
Mandated fees under Affordable Care Act	39,606				$ 25,723				$ 39,606	$ 25,723
Individual and Small Business Group
Accounting Policies [Line Items]
Minimum medical loss ratio									80.00%
Large Group Business
Accounting Policies [Line Items]
Minimum medical loss ratio									85.00%
Maximum | Buildings
Accounting Policies [Line Items]
Property and equipment, estimated useful lives, maximum (in years)									39 years 6 months
Maximum | Furniture
Accounting Policies [Line Items]
Property and equipment, estimated useful lives, maximum (in years)									7 years
Maximum | Equipment
Accounting Policies [Line Items]
Property and equipment, estimated useful lives, maximum (in years)									5 years
Maximum | Software and Software Development Costs
Accounting Policies [Line Items]
Property and equipment, estimated useful lives, maximum (in years)									20 years
Restatement Adjustment
Accounting Policies [Line Items]
Decrease in net income related to correction of errors	8,200
Overstatement of inventory and accounts receivable	$ 8,200