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Covid-19 Uncertainties and Liquidity Risk (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents and credit facility borrowing capacity   $ 131,898    
Credit facilities $ 158,616   $ 146,535 $ 69,302
Revolving Credit Facility [member]        
Borrowings amount that matured 30,000      
Borrowing capacity 110,000      
Credit facilities $ 80,000