Significant Accounting Policies Significant Accounting Policies (Aging of Gross Accounts Receivable (net of contractual adjustments)) (Details)	12 Months Ended
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current Fiscal Year End Date	--12-31

End date of current fiscal year in the format --MM-DD.

No definition available.

Name:	dei_CurrentFiscalYearEndDate
Namespace Prefix:	dei_
Data Type:	xbrli:gMonthDayItemType
Balance Type:	na
Period Type:	duration