Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Collateral posted with broker for derivative instruments	$ 4,076	$ 2,759
Prepaid insurance	0	7,727
Deferred financing costs	280	0
Derivative assets	118	5,164
Other	6,021	12,720
Total	$ 10,495	$ 28,370