Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Collateral posted with broker for derivative instruments	$ 2,656	$ 2,759
Prepaid insurance	3,791	7,727
Deferred financing costs	335	0
Derivative assets	1,730	5,164
Other	5,321	12,720
Total	$ 13,833	$ 28,370