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Financial Instruments: Derivatives and Hedging (Details) - USD ($)
$ in Thousands
Jun. 04, 2021
Jun. 30, 2021
Dec. 31, 2020
Financial Instruments: Derivatives and Hedging      
Hedged amount of portion of the future LIBOR-based rate risk   $ 9,400  
Amount estimated to be reclassified into earnings within next 12 months   4,300  
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%  
2017 Interest Rate Swap | Cash flow hedges | Level 2      
Financial Instruments: Derivatives and Hedging      
Fair Value   $ (992) $ (2,947)
2019 JPM Interest Rate Swap      
Financial Instruments: Derivatives and Hedging      
Payment to terminate interest rate swap $ 1,200    
2019 JPM Interest Rate Swap | Cash flow hedges      
Financial Instruments: Derivatives and Hedging      
Notional Value   $ 100,000  
Strike Rate (as a percent)   2.44%  
2019 JPM Interest Rate Swap | Cash flow hedges | Level 2      
Financial Instruments: Derivatives and Hedging      
Fair Value     (2,102)
2019 BMO Interest Rate Swap      
Financial Instruments: Derivatives and Hedging      
Payment to terminate interest rate swap 600    
2019 BMO Interest Rate Swap | Cash flow hedges      
Financial Instruments: Derivatives and Hedging      
Notional Value $ 165,000 $ 165,000  
Strike Rate (as a percent)   2.39%  
2019 BMO Interest Rate Swap | Cash flow hedges | Level 2      
Financial Instruments: Derivatives and Hedging      
Fair Value   $ (8,433) $ (12,262)