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Fair Value (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
derivative
Sep. 30, 2021
USD ($)
derivative
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
derivative
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivative instruments and Hedging Activities            
Derivative, Notional Amounts Settled During Period $ 200,000,000   $ 150,000,000      
Receipt (payment) for termination of forward interest rate swaps $ (2,211,000)   6,962,000 $ 4,751,000 $ (25,135,000)  
Unrealized gain on terminated cash flow hedges     $ (2,654,000) (2,654,000) $ 0 $ 2,894,000
Interest Rate Swap | Cash Flow Hedges            
Derivative instruments and Hedging Activities            
Derivative, Notional Amounts Entered Into During Period   $ 150,000,000        
Reclassification out of Accumulated Other Comprehensive Income            
Derivative instruments and Hedging Activities            
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months       $ 4,051,000    
Not Designated as Hedging Instrument            
Derivative instruments and Hedging Activities            
Number of derivative instruments held | derivative 5 5   5