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Derivative Instruments and Hedging Activities Derivative Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Interest Rate Swap No. 2 [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, term of contract 5 years   5 years
Fair value of interest rate derivatives     $ (368)
Unrealized gain (loss) on interest rate cash flow hedges $ (831) $ (6)  
Interest Rate Swap No. 1 [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, term of contract 10 years   10 years
Fair value of interest rate derivatives     $ (2,123)
Unrealized gain (loss) on interest rate cash flow hedges $ 490 52  
Interest Rate Swap No. 3 [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, term of contract 10 years    
Fair value of interest rate derivatives $ (2,386)    
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value of interest rate derivatives (2,386)   $ (2,491)
Unrealized gain (loss) on interest rate cash flow hedges $ (341) $ 46