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Balance Sheet Components Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
Collateral posted for derivative instruments after netting with outstanding derivative liabilities | $ 0 | $ 26,809
Prepayments | 24,515 | 17,536
Other | 6,084 | 9,665
Other Assets, Current | $ 30,599 | $ 54,010

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