Summary Of Significant Accounting Policies (Schedule Of Trust Assets And Reinsurance Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	$ 167,706		$ 104,679
Accounts payable and accrued liabilities	98,131		95,858
Trust Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	48,412		42,026
Unearned Premium [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	37,161		32,335
Claims Reserve [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	$ 1,515	[1]	$ 1,297	[1]

[1] The claims reserve is estimated based on historical claims experience.