Derivatives and Hedging Activities, Effect of Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) - Interest Rate Swaps [Member] - Designated as Hedging Instrument [Member] - Cash Flow Hedges [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income (Expense), Net [Member]
Derivatives and Hedging Activities [Abstract]
Gain (loss) reclassified from accumulated other comprehensive loss into income	$ (45)	$ (8)	$ (110)	$ (8)
Other Comprehensive Loss [Member]
Derivatives and Hedging Activities [Abstract]
Gain (loss) recognized in OCI	$ 32	$ 388	$ 3,133	$ 388