Balance Sheet Parenthetical (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Debt Securities, Amortized Cost Basis	$ 1,893,356	$ 528,660
Available-for-sale Equity Securities, Amortized Cost Basis	$ 75,538	$ 76,900
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	485,000,000	485,000,000
Common Stock, Shares, Issued	224,432,465	208,601,020
Common Stock, Shares, Outstanding	206,871,768	191,053,530
Treasury Stock, Shares	17,560,697	17,547,490