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Fair Value Measurements (Schedule of Effective Maturity Dates of Held To Maturity Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Held-to-maturity Debt Maturities, Less than 1 year, Book Value	$ 585,875	$ 206,257
Held-to-maturity Debt Maturities, 1 through 5 years, Book Value	3,859	0
Held-to-maturity Debt Maturities, Total Book Value	589,734	206,257
Held-to-maturity Debt Maturities, Less than 1 year, Fair Value	585,573	206,161
Held-to-maturity Debt Maturities, 1 through 5 years, Fair Value	3,859	0
Held-to-maturity Debt Maturities, Total Fair Value	589,432	206,161
Available-for-sale Securities, Debt Maturities [Abstract]
Available-for-sale maturity, greater than 5 years, book value	847	1,012
Available-for-sale maturities, greater than 5 years, fair value	$ 847	$ 1,016

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