Related-Party Transactions (Narrative) (Details)	9 Months Ended
Sep. 30, 2012 USD ($)	Sep. 30, 2012 GBP (£)
Related-Party Transactions [Abstract]
Stock repurchase program, number of shares held	9,719,971	9,719,971
Reserve indemnity agreement, percent	90.00%	90.00%
Reserve indemnity agreement, amount		£ 25,000,000
Amount received for subsidiaries sold, book value	$ 61,005,000

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

No definition available.

Name:	us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration