Significant Accounting Policies (Health Plan Services Health Care Cost) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Health Care Organization Revenue and Expense [Line Items]
Prior Years Favorable Reserve Development	$ 3,700,000		$ 26,600,000
Health plan services (excluding depreciation and amortization)	2,763,179,000	2,191,918,000	5,165,521,000	4,460,654,000
Provision For Adverse Deviation, Release	4,800,000		50,800,000
Provision For Adverse Deviation	67,100,000		67,100,000		53,400,000
Unfavorable Development [Member]
Health Care Organization Revenue and Expense [Line Items]
Health plan services (excluding depreciation and amortization)	$ 1,100,000		$ 24,200,000