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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair value of Cash and Cash Equivalents by Balance Sheet Grouping | Cash and cash equivalents consist of the following:
|  | June 30, 2019 |  |  | December 31, 2018 |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Cash and Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and overnight deposits |  | $ | 513,328 |  |  | $ | 513,328 |  |  | $ | 427,307 |  |  | $ | 427,307 |
Corporate commercial paper |  |  | 530,565 |  |  |  | 530,991 |  |  |  | 467,300 |  |  |  | 467,760 |
Time deposits |  |  | 38,757 |  |  |  | 38,757 |  |  |  | 29,128 |  |  |  | 29,128 |
Total cash and cash equivalents |  | $ | 1,082,650 |  |  | $ | 1,083,076 |  |  | $ | 923,735 |  |  | $ | 924,195 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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