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Balance Sheet Components Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Collateral posted for derivative instruments after netting with outstanding derivative liabilities $ 1,400 $ 26,809
Prepayments 19,377 17,536
Other 16,216 9,665
Other Assets, Current $ 36,993 $ 54,010