Repurchase of Collateral Finance Facility Notes (Narrative) (USD $)	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Repurchase Of Collateral Finance Facility Notes Abstract
Repurchased Subsidiary debt	$ 12,700,000
Repurchase of long-term debt	7,586,000	0
Gains Losses On Extinguishment Of Subsidiary Debt	$ 5,000,000

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph b

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration