Derivative Instruments and Hedging Activities - Summary of Commodity Derivative Activity (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative Assets
Gross Amounts Recognized	$ 9,837	$ 3,993
Net Amount Presented	9,837	3,993
Derivative Liability
Gross Amounts Recognized	1,924	245
Net Amount Presented	1,924	245
Current portion of derivative liabilities, related party | Commodity swaps
Derivative Assets
Gross Amounts Recognized	2,861
Net Amount Presented	2,861
Derivative Liability
Gross Amounts Recognized		164
Net Amount Presented		164
Long-term portion of derivative assets, related party | Commodity swaps
Derivative Assets
Gross Amounts Recognized	6,882	3,270
Net Amount Presented	6,882	3,270
Prepaid expenses and other current assets | Fueling agreements
Derivative Assets
Gross Amounts Recognized	12	232
Net Amount Presented	12	232
Notes receivable and other long-term assets, net | Fueling agreements
Derivative Assets
Gross Amounts Recognized	82	491
Net Amount Presented	82	491
Accrued liabilities | Fueling agreements
Derivative Liability
Gross Amounts Recognized	715	42
Net Amount Presented	715	42
Other long-term liabilities | Fueling agreements
Derivative Liability
Gross Amounts Recognized	1,209	39
Net Amount Presented	$ 1,209	$ 39