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Investments (Details 18) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Financing Receivable Impaired [Line Items]          
Unpaid Principal Balance $ 38,296   $ 38,296   $ 40,566
Recorded Investment 37,617   37,617   39,956
Related Allowance 4,738   4,738   6,980
Carrying Value 32,879   32,879   32,976
Average Investment 39,392 [1] 52,332 [1] 39,580 [1] 55,189 [1]  
Interest Income 343 438 718 915  
Impaired mortgage loans with valuation allowance recorded
          
Financing Receivable Impaired [Line Items]          
Unpaid Principal Balance 21,582   21,582   27,527
Recorded Investment 21,513   21,513   27,460
Related Allowance 4,738   4,738   6,980
Carrying Value 16,775   16,775   20,480
Average Investment 24,211 [1] 41,747 [1] 25,294 [1] 37,634 [1]  
Interest Income 294 410 534 718  
Impaired mortgage loans with no valuation allowance recorded
          
Financing Receivable Impaired [Line Items]          
Unpaid Principal Balance 16,714   16,714   13,039
Recorded Investment 16,104   16,104   12,496
Related Allowance 0   0   0
Carrying Value 16,104   16,104   12,496
Average Investment 15,181 [1] 10,585 [1] 14,286 [1] 17,555 [1]  
Interest Income $ 49 $ 28 $ 184 $ 197  
[1] Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.