State-Sponsored Health Plans Rate Settlement Agreement (Details) (USD $)		3 Months Ended	6 Months Ended		6 Months Ended
	Dec. 31, 2012	Jun. 30, 2013 Medicaid Premium Revenue [Member]	Jun. 30, 2013 Medicaid Premium Revenue [Member]	Jun. 30, 2013 Income Approach [Member] Level 3 [Member]	Jun. 30, 2013 Minimum [Member] Income Approach [Member] Level 3 [Member] Medicaid Premium Revenue [Member]	Jun. 30, 2013 Maximum [Member] Income Approach [Member] Level 3 [Member] Medicaid Premium Revenue [Member]	Jun. 30, 2013 Weighted Average [Member] Income Approach [Member] Level 3 [Member] Medicaid Premium Revenue [Member]
State-Sponsored Health Plans Rate Settlement Agreement [Line Items]
Other Assets, Fair Value Disclosure				$ 35,400,000
Settlement account balance, beginning	0
Settlement account payment, maximum		264,000,000
Settlement account payment, current balance			35,400,000
Receivable with Imputed Interest, Discount		$ 2,700,000	$ 2,700,000
Discount Rate, range (as a percentage)			1.135%		1.135%	1.135%	1.135%