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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 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:
|  |  | December 31, 2019 |  |  | December 31, 2018 |
|  |  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
| Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Cash and overnight deposits |  | $ | 417,456 |  |  | $ | 417,456 |  |  | $ | 427,307 |  |  | $ | 427,307 |
| Corporate commercial paper |  |  | 775,504 |  |  |  | 776,356 |  |  |  | 467,300 |  |  |  | 467,760 |
| Time deposits |  |  | 37,531 |  |  |  | 37,531 |  |  |  | 29,128 |  |  |  | 29,128 |
| Total cash and cash equivalents |  | $ | 1,230,491 |  |  | $ | 1,231,343 |  |  | $ | 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=118260190&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=117815213&loc=d3e19207-110258 + Details
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