Land, Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Land, Property and Equipment
Land, property and equipment, gross	$ 704,488		$ 704,488		$ 693,689
Less accumulated depreciation	(450,905)		(450,905)		(431,928)
Total land, property and equipment, net	253,583		253,583		261,761
Capitalized software costs, net	34,800		34,800		33,800
Accumulated amortization on the capitalized software costs	31,000		31,000		30,400
Amortization expense related to the capitalized software costs	300	$ 400	600	$ 900
Amount included in accounts payable balances			2,600		2,100
Land
Land, Property and Equipment
Land, property and equipment, gross	3,476		3,476		3,476
LNG liquefaction plants
Land, Property and Equipment
Land, property and equipment, gross	94,633		94,633		94,633
Station equipment
Land, Property and Equipment
Land, property and equipment, gross	357,315		357,315		354,699
Trailers
Land, Property and Equipment
Land, property and equipment, gross	73,046		73,046		72,783
Other equipment
Land, Property and Equipment
Land, property and equipment, gross	95,362		95,362		93,135
Construction in progress
Land, Property and Equipment
Land, property and equipment, gross	$ 80,656		$ 80,656		$ 74,963