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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Interest Rate Swap No. 2 [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, term of contract     5 years    
Fair value of interest rate derivatives $ (1,175)   $ (1,175)    
Unrealized gain (loss) on interest rate cash flow hedges 51 $ (47) $ 45 $ (96)  
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 (2,446)   $ (2,446)   $ (1,054)
Unrealized gain (loss) on interest rate cash flow hedges 126 2 178 2  
Interest Rate Swap [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value of interest rate derivatives (3,621)   (3,621)   $ (1,054)
Unrealized gain (loss) on interest rate cash flow hedges $ 177 $ (45) $ 223 $ (94)