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Financial Instruments - Fair Value of Derivative Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative $ 1,709 $ 396
Other liabilities | Interest Rate Collar    
Derivative [Line Items]    
Derivative $ 1,709 $ 396