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Fair Value Measurements (Schedule of Effective Maturity Dates of Held To Maturity Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment maturity |  |
Held-to-maturity Debt Maturities, Less than 1 year, Book Value | $ 572,815 | $ 206,161
Held-to-maturity Debt Maturities, 1 through 5 years, Book Value | 13,776 | 0
Held-to-maturity Debt Maturities, Greater than 5 years, Book Value | 844 | 1,016
Held-to-maturity Debt Maturities, Total Book Value | 587,435 | 207,177
Held-to-maturity Debt Maturities, Less than 1 year, Fair Value | 572,516 | 206,161
Held-to-maturity Debt Maturities, 1 through 5 years, Fair Value | 13,771 | 0
Held-to-maturity Debt Maturities, Greater than 5 years, Fair Value | 967 | 1,016
Held-to-maturity Debt Maturities, Total Fair Value | $ 587,254 | $ 207,177

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