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Mortgage Loans on Real Estate (Allowance for Loan Losses Rollforward) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance balance $ (14,142)  
Ending allowance balance (11,750)  
Specific Allowance [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance balance (7,842) $ (12,333)
Charge-offs 0 128
Recoveries 3,340 1,255
Change in provision for credit losses (1,248) (1,502)
Ending allowance balance (5,750) (12,452)
General Allowance [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance balance (6,300) (10,300)
Charge-offs 0 0
Recoveries 0 0
Change in provision for credit losses 300 3,300
Ending allowance balance $ (6,000) $ (7,000)