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Mortgage Loans on Real Estate (Rollforward of Allowance for Loan Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Specific Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance $ (7,842) $ (12,333) $ (16,847)
Charge-offs 5,078 2,045 9,211
Recoveries 5,483 5,428 255
Change in provision for credit losses (4,046) (2,982) (4,952)
Ending allowance balance (1,327) (7,842) (12,333)
General Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (6,300) (10,300) (9,200)
Charge-offs 0 0 0
Recoveries 0 0 0
Change in provision for credit losses (800) 4,000 (1,100)
Ending allowance balance $ (7,100) $ (6,300) $ (10,300)