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Financial Instruments: Derivatives and Hedging (Details) - USD ($)
$ in Thousands
Nov. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial Instruments: Derivatives and Hedging      
Hedged amount of portion of the future LIBOR-based rate risk   $ 17,300  
Amount estimated to be reclassified into earnings within next 12 months   9,000  
JPM Term Loan      
Financial Instruments: Derivatives and Hedging      
Hedged amount of portion of the future LIBOR-based rate risk   100,000  
2017 Interest Rate Swap | Cash flow hedges      
Financial Instruments: Derivatives and Hedging      
Notional Value   $ 400,000  
Strike Rate (as a percent)   1.12%  
Fair Value   $ (2,947) $ 3,022
2013 BMO Interest Rate Swap | Cash flow hedges      
Financial Instruments: Derivatives and Hedging      
Notional Value   $ 220,000  
Strike Rate (as a percent)   2.32%  
Fair Value     (963)
2019 JPM Interest Rate Swap | Cash flow hedges      
Financial Instruments: Derivatives and Hedging      
Notional Value   $ 100,000  
Strike Rate (as a percent)   2.44%  
Fair Value   $ (2,102) (1,634)
2019 BMO Interest Rate Swap | Cash flow hedges      
Financial Instruments: Derivatives and Hedging      
Notional Value   $ 220,000  
Strike Rate (as a percent)   2.39%  
Fair Value   $ (12,262) $ (5,107)
2019 BMO Interest Rate Swap | Cash flow hedges | Forecast      
Financial Instruments: Derivatives and Hedging      
Notional Value $ 165,000