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Other Balance Sheet Items (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract] |  |
Amortization of Other Deferred Charges | $ 36,200 |
Deposits Assets, Noncurrent | 145,000 | $ 145,000
Unrecognized Tax Benefits, Period Increase (Decrease) | $ 204,200 |

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