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Investments - Realized gains and losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales or calls $ 1,575 $ 31,055 $ 37,428 $ 38,554
Gross realized gains from sales or calls 0 1,128 1,401 1,694
Gross realized losses from sales or calls $ 0 $ (285) $ (268) $ (407)