Related Party Transactions (General) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Buyer deficiency fee			$ 51,395
IMA, Partnership earned amount added to market rate, basis points	five
Affiliated Entity | Westlake
Related Party Transaction [Line Items]
Interest earned related to the IMA	$ 52	$ 67
Operating lease expense	686	$ 686
Accrued Liabilities | Affiliated Entity | Westlake
Related Party Transaction [Line Items]
Accrued interest included in receivable under IMA	$ 52		$ 71