Significant Accounting Policies (Medicaid/Medi-Cal Adjustments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]
Medicaid retro rate adjustment	$ 42
Percent reduction in provider reimbursement rates		10.00%