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Other Balance Sheet Items (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |
Amortization of Other Deferred Charges | $ 34,600 |
Deposits Assets, Noncurrent | $ 145,000 | $ 145,000

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