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Investments (Details 2) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cumulative credit loss    
Beginning of period [1] $ 2,877 $ 4,097
New credit losses [1] 4,998 280
Losses related to securities sold or paid down during the period [1] 0 0
End of period [1] $ 7,875 $ 4,377
[1] The cumulative credit loss amounts exclude other-than-temporary impairment losses on securities held as of the periods indicated that the Company intended to sell or it was more likely than not that the Company would be required to sell the security before the recovery of the amortized cost basis.