Short-term and Long-term Investments, Restricted Deposits - Narrative (Details) |
12 Months Ended |
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Dec. 31, 2019
position
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| Schedule Of Investments And Restricted Deposits By Type [Line Items] | |
| Positions from which gross unrealized losses were generated | 682 |
| Total number of positions | 4,529 |
| Commercial mortgage- backed securities | |
| Schedule Of Investments And Restricted Deposits By Type [Line Items] | |
| Investments that carry rating of A A plus, weighted average, duration | 4 years |
| External Credit Rating, Investment Grade | Rated Securities | |
| Schedule Of Investments And Restricted Deposits By Type [Line Items] | |
| Percentage of investment grade investments rated by nationally recognized statistical rating organizations | 97.00% |
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- Definition Investments Recorded At Fair Value That Carry Rating Of A A Plus, Weighted Average, Duration No definition available.
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- Definition Positions from which gross unrealized losses were generated No definition available.
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- Definition Total Unrealized Investment Positions No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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