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Other Balance Sheet Items Other Balance Sheet Items (Goodwill) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Balance Sheet Related Disclosures [Abstract] |  |
Goodwill, Gross | $ 1,537,843 | $ 1,537,843
Goodwill, Impaired, Accumulated Impairment Loss | (1,485,316) | (1,485,316)
Goodwill | $ 52,527 | $ 52,527

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