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Mortgage Loans on Real Estate (Allowance for Loan Losses Rollforward) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Specific Allowance [Member]
Sep. 30, 2012
Specific Allowance [Member]
Sep. 30, 2013
Specific Allowance [Member]
Sep. 30, 2012
Specific Allowance [Member]
Sep. 30, 2013
General Allowance [Member]
Sep. 30, 2012
General Allowance [Member]
Sep. 30, 2013
General Allowance [Member]
Sep. 30, 2012
General Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Beginning allowance balance $ (5,617) $ (10,969) $ (21,176) $ (25,445) $ (23,134) $ (23,664) $ (10,500) $ (11,200) $ (11,100) $ (9,300)
Charge-offs     3,749 1,932 7,930 10,445 0 0 0 0
Recoveries     0 0 0 0 0 0 0 0
Provision for credit losses     (2,691) (2,909) (4,914) (13,203) (500) (400) 100 (2,300)
Ending allowance balance $ (5,617) $ (10,969) $ (20,118) $ (26,422) $ (20,118) $ (26,422) $ (11,000) $ (11,600) $ (11,000) $ (11,600)