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Derivative Instruments and Hedging Activities Derivative Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Interest Rate Swap No. 1 [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value of interest rate derivatives $ 0   $ 0   $ (368)
Derivative, term of contract     5 years   5 years
Unrealized gain (loss) on interest rate cash flow hedges 0 $ 51 $ (831) $ 45  
Interest Rate Swap No. 2 [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value of interest rate derivatives 0   $ 0   $ (2,123)
Derivative, term of contract     10 years   10 years
Unrealized gain (loss) on interest rate cash flow hedges 0 125 $ 490 178  
Forward Interest Rate Swap [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value of interest rate derivatives (5,400)   $ (5,400)   $ 0
Derivative, term of contract     10 years   10 years
Interest Rate Swap [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value of interest rate derivatives (5,400)   $ (5,400)   $ (2,491)
Unrealized gain (loss) on interest rate cash flow hedges $ 0 $ 176 $ (341) $ 223