Derivative Instruments - Derivative Financial Instruments by Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Gross amounts of commodity derivative contracts recognized at fair value	$ 4,783	$ 3,458
Cash collateral	11,110	14,139
Total gross amount recognized	15,893	17,597
Gross amounts offset	(6,242)	(12,164)
Net amount reported in the Consolidated Balance Sheets	9,651	5,433
Liabilities
Gross amounts of commodity derivative contracts recognized at fair value	6,242	12,164
Cash collateral		0
Total gross amount recognized	6,242	12,164
Gross amounts offset	(6,242)	(12,164)
Net amount reported in the Consolidated Balance Sheets	$ 0	$ 0