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Mortgage Loans on Real Estate Schedule of Impaired Financing Receivables (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 29,976	$ 44,034	$ 17,803
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	27,765	63,023	81,994
Impaired Financing Receivable, Recorded Investment	57,741	107,057	99,797
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	53,110	67,698	31,027
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	27,765	63,023	81,994
Impaired Financing Receivable, Unpaid Principal Balance	80,875	130,721	113,021
Impaired Financing Receivable, Related Allowance	(23,134)	(23,664)	(13,224)
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	37,480	53,617	24,062
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	27,696	60,974	82,535
Impaired Financing Receivable, Average Recorded Investment	65,176	114,591	106,597
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1,946	3,284	656
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1,664	3,509	4,921
Impaired Financing Receivable, Interest Income, Accrual Method	$ 3,610	$ 6,793	$ 5,577

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