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Mortgage Loans on Real Estate (Rollforward of Allowance for Loan Losses) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Ending allowance balance $ (26,047) $ (34,234)  
Specific Allowance [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (23,134) (23,664) (13,224)
Charge-offs 9,738 15,562 14,030
Recoveries 4,070 0 0
Change in provision for credit losses (7,521) (15,032) (24,470)
Ending allowance balance (16,847) (23,134) (23,664)
General Allowance [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning allowance balance (11,100) (9,300) (3,000)
Charge-offs 0 0 0
Recoveries 0 0 0
Change in provision for credit losses 1,900 (1,800) (6,300)
Ending allowance balance $ (9,200) $ (11,100) $ (9,300)