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Mortgage Loans on Real Estate (Allowance for Loan Losses Rollforward) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance balance $ (8,427)  
Ending allowance balance (8,127)  
Specific Allowance [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance balance (1,327) $ (7,842)
Charge-offs 0 0
Recoveries 0 3,340
Change in provision for credit losses 0 (1,248)
Ending allowance balance (1,327) (5,750)
General Allowance [Member]    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance balance (7,100) (6,300)
Charge-offs 0 0
Recoveries 0 0
Change in provision for credit losses 300 300
Ending allowance balance $ (6,800) $ (6,000)