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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other than temporary impairment credit losses        
Net other-than-temporary impairment loss recognized in earnings $ 0 $ (397) $ 0 $ (397)