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Derivatives - Effect of Derivative Instruments on Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Effect of derivative instruments on results of operations        
Total amount of interest expense in which the effects of cash flow hedges are recorded $ 25,958 $ 25,778 $ 57,203 $ 55,443
Interest Rate Swaps        
Effect of derivative instruments on results of operations        
Pre-tax gain (loss) recognized in other comprehensive income (loss) (79) (738) (89) (8,311)
Pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense (1,302) (1,073) (2,573) (1,322)
Total amount of interest expense in which the effects of cash flow hedges are recorded $ 25,958 $ 25,778 $ 57,203 $ 55,443