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Mortgage Loans on Real Estate (Rollforward of Allowance for Loan Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance $ (22,633)    
Ending allowance balance (14,142) $ (22,633)  
Specific Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (12,333) (16,847) $ (23,134)
Charge-offs 2,045 9,211 9,738
Recoveries 5,428 255 4,070
Change in provision for credit losses (2,982) (4,952) (7,521)
Ending allowance balance (7,842) (12,333) (16,847)
General Allowance [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (10,300) (9,200) (11,100)
Charge-offs 0 0 0
Recoveries 0 0 0
Change in provision for credit losses 4,000 (1,100) 1,900
Ending allowance balance $ (6,300) $ (10,300) $ (9,200)