Derivative Instruments and Hedging Activities - Summary of Commodity Derivative Activity (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative Assets
Gross Amounts Recognized	$ 3,993	$ 10,332
Net Amount Presented	3,993	10,332
Derivative Liability
Gross Amounts Recognized	245
Net Amount Presented	245
Current portion of derivative assets, related party | Commodity swap contracts
Derivative Assets
Gross Amounts Recognized		1,508
Net Amount Presented		1,508
Long-term portion of derivative assets, related party | Commodity swap contracts
Derivative Assets
Gross Amounts Recognized	3,270	8,824
Net Amount Presented	3,270	$ 8,824
Current portion of derivative liabilities, related party | Commodity swap contracts
Derivative Liability
Gross Amounts Recognized	164
Net Amount Presented	164
Prepaid expenses and other current assets | Fueling agreements
Derivative Assets
Gross Amounts Recognized	232
Net Amount Presented	232
Notes receivable and other long-term assets, net | Fueling agreements
Derivative Assets
Gross Amounts Recognized	491
Net Amount Presented	491
Accrued liabilities | Fueling agreements
Derivative Liability
Gross Amounts Recognized	42
Net Amount Presented	42
Other long-term liabilities | Fueling agreements
Derivative Liability
Gross Amounts Recognized	39
Net Amount Presented	$ 39