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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - Interest rate swap - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative assets - interest rate swaps $ 2,109 $ 2,286
Derivative liabilities - interest rate swaps 2,880 16,985
Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets - interest rate swaps 2,109 2,286
Derivative liabilities - interest rate swaps $ 2,880 $ 16,985