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Mortgage Loans on Real Estate (Allowance for Loan Losses Rollforward) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning allowance balance     $ (22,633)  
Ending allowance balance $ (17,518)   (17,518)  
Specific Allowance [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning allowance balance (9,316) $ (17,282) (12,333) $ (16,847)
Charge-offs 0 958 143 3,715
Recoveries     4,375 255
Change in provision for credit losses (1,302) (1,040) (2,803) (4,487)
Ending allowance balance (10,618) (17,364) (10,618) (17,364)
General Allowance [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Beginning allowance balance (7,500) (9,300) (10,300) (9,200)
Charge-offs 0 0 0 0
Recoveries     0 0
Change in provision for credit losses 600 (1,200) 3,400 (1,300)
Ending allowance balance $ (6,900) $ (10,500) $ (6,900) $ (10,500)