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Derivative Instruments - Location and Fair Value Amounts of Derivative Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Current portion of derivative assets $ 0 $ 577
Current portion of derivative liabilities (note 8) 414 86
Derivative liabilities (note 8) $ 789 $ 0
Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 3.50%