Related Party Transactions (Debt Payable to Related Parties) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Interest on related party debt payable	$ 2,199	$ 2,236
Long-term debt payable to Westlake	22,619		$ 399,674
Due to Related Parties	399,674
Other income (expense) \| Affiliated Entity \| Westlake
Related Party Transaction [Line Items]
Interest on related party debt payable	2,199	$ 2,236
Accrued Liabilities \| Affiliated Entity \| Westlake
Related Party Transaction [Line Items]
Accrued interest on related party debt	$ 2,213		$ 2,176

Carrying amount as of the balance sheet date of obligations due all related parties.

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+ Details

- Definition

Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer.

+ References

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+ Details