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Fair Value - Recurring Basis (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Financial assets:    
Short-term investments $ 0 $ 59,474,000
Financial liabilities:    
Derivative instruments - interest rate swaps 117,265,000 65,078,000
Carrying Amount    
Financial assets:    
Short-term investments 0 59,474,000
Carrying Amount | Interest Rate Swaps    
Financial liabilities:    
Derivative instruments - interest rate swaps 117,265,000 65,078,000
Level 1 | Fair Value    
Financial assets:    
Short-term investments 0 0
Level 1 | Fair Value | Interest Rate Swaps    
Financial liabilities:    
Derivative instruments - interest rate swaps 0 0
Level 2 | Fair Value    
Financial assets:    
Short-term investments 0 59,474,000
Level 2 | Fair Value | Interest Rate Swaps    
Financial liabilities:    
Derivative instruments - interest rate swaps 117,265,000 65,078,000
Level 3 | Fair Value    
Financial assets:    
Short-term investments 0 0
Level 3 | Fair Value | Interest Rate Swaps    
Financial liabilities:    
Derivative instruments - interest rate swaps $ 0 $ 0