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Supplemental Information for Statement of Cash Flows (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Information for Statement of Cash Flows        
Cash and cash equivalents $ 4,268 $ 7,403    
Restricted cash 7,859 7,812    
Total $ 12,127 $ 15,215 $ 13,830 $ 11,437