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Mortgage Loans on Real Estate (Rollforward of Allowance for Loan Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance $ (8,427)    
Ending allowance balance (7,518) $ (8,427)  
Specific Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (1,327) (7,842) $ (12,333)
Charge-offs 0 5,078 2,045
Recoveries 631 5,483 5,428
Change in provision for credit losses (722) (4,046) (2,982)
Ending allowance balance (1,418) (1,327) (7,842)
General Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (7,100) (6,300) (10,300)
Charge-offs 0 0 0
Recoveries 0 0 0
Change in provision for credit losses 1,000 (800) 4,000
Ending allowance balance $ (6,100) $ (7,100) $ (6,300)