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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
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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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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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