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Fair Value - Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financial assets:    
Short-term investments $ 0 $ 19,973
Financial liabilities:    
Derivative instruments - interest rate swaps 80,143 92,521
Carrying Amount | Recurring    
Financial assets:    
Short-term investments 0 19,973
Carrying Amount | Interest Rate Swaps | Recurring    
Financial liabilities:    
Derivative instruments - interest rate swaps 80,143 92,521
Level 1 | Fair Value | Recurring    
Financial assets:    
Short-term investments 0 0
Level 1 | Fair Value | Interest Rate Swaps | Recurring    
Financial liabilities:    
Derivative instruments - interest rate swaps 0 0
Level 2 | Fair Value | Recurring    
Financial assets:    
Short-term investments 0 19,973
Level 2 | Fair Value | Interest Rate Swaps | Recurring    
Financial liabilities:    
Derivative instruments - interest rate swaps 80,143 92,521
Level 3 | Fair Value | Recurring    
Financial assets:    
Short-term investments 0 0
Level 3 | Fair Value | Interest Rate Swaps | Recurring    
Financial liabilities:    
Derivative instruments - interest rate swaps $ 0 $ 0