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Balance Sheet Components Other Current Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
Collateral posted for derivative instruments after netting with outstanding derivative liabilities | $ 37,347 | $ 26,809
Prepayments | 16,647 | 17,536
Other | 6,954 | 9,665
Other Assets, Current | $ 60,948 | $ 54,010

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