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Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Collateral posted with broker for derivative instruments $ 2,969 $ 215
Prepaid insurance 109 7,547
Derivative assets 554 4,296
Other 6,607 5,221
Total $ 10,239 $ 17,279