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Investments (Proceeds from Sales of Securities and Realized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Investments [Abstract]        
Proceeds $ 47,637 $ 0 $ 56,222 $ 35,136
Realized gains 1,210 0 1,305 412
Realized losses $ 196 $ 23 $ 359 $ 185