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Financial Statement Schedule I (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Additional Information - Financial Statement Schedule I    
Restricted net assets of the entity's consolidated and unconsolidated subsidiaries not available for distribution $ 568,931 $ 568,931,000
Threshold percentage of restricted net assets of the entity's consolidated and unconsolidated subsidiaries 25.00%