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Subsequent Events (Narrative) (Details) $ in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 13, 2019 USD ($) people shares | May 17, 2018 shares | Mar. 21, 2018 shares | Feb. 16, 2018 people shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares | Dec. 31, 2016 shares | Feb. 17, 2019 ft²
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of people granted awards | people |  |  |  | 3 |  |  |  |
Number of RSUs granted (in shares) | shares |  | 9,294 | 13,215 | 52,166 | 74,000 | 98,000 | 129,000 |
Award vesting period |  |  | 3 years | 3 years |  |  |  |
Subsequent Event | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Restricted stock units grant date fair value | $ | $ 1.8 |  |  |  |  |  |  |
Number of RSUs granted (in shares) | shares | 38,860 |  |  |  |  |  |  |
Subsequent Event | Restricted Stock Units (RSUs) | Vesting on January 1, 2022 |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Award vesting rights (percentage) | 25.00% |  |  |  |  |  |  |
Subsequent Event | Performance Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |
Israel | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  | 121,400
Executive Officer | Subsequent Event | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of people granted awards | people | 3 |  |  |  |  |  |  |
Executive Officer | Subsequent Event | Performance Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Percentage of performance based units on total units approved | 75.00% |  |  |  |  |  |  |

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