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Fair Value Measurements - Recurring Measurements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Cash Flow Hedges:    
Deferred amounts in accumulated comprehensive income (loss) that will be reclassified into earnings $ (4,229)  
Fair Value, Measurements, Recurring | Level 1    
Cash Flow Hedges:    
Derivative interest rate liabilities 0 $ 0
Fair Value, Measurements, Recurring | Level 2    
Cash Flow Hedges:    
Derivative interest rate liabilities (7,661) (12,449)
Fair Value, Measurements, Recurring | Level 3    
Cash Flow Hedges:    
Derivative interest rate liabilities $ 0 $ 0