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Mortgage Loans on Real Estate Schedule of Impaired Financing Receivables (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Months
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
Impaired Mortgage Loans, Workout Terms, Interest Only Payments, Six Month Terms 6  
Impaired Mortgage Loans, Workout Terms, Interest Only Payments, Twelve Month Terms 12  
Impaired Mortgage Loans, Workout Terms, Cash Flow Sweep, Number of Months 12  
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 23,887 $ 29,976
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 20,413 27,765
Impaired Financing Receivable, Recorded Investment 44,300 57,741
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 46,518 53,110
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 20,413 27,765
Impaired Financing Receivable, Unpaid Principal Balance 66,931 80,875
Impaired Financing Receivable, Related Allowance (22,631) (23,134)
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 28,384 37,480
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 20,505 27,696
Impaired Financing Receivable, Average Recorded Investment 48,889 65,176
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 331 1,946
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 284 1,664
Impaired Financing Receivable, Interest Income, Accrual Method $ 615 $ 3,610