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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Amortized cost $ 2,235,684 $ 2,337,715
Fair Value, Held-to-maturity $ 825,928 $ 853,039
Common stock, par value
Common stock, authorized 225,000,000 225,000,000
Common stock, shares issued 107,786,175 106,384,982
Common stock, shares outstanding 107,786,175 106,384,982