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Derivatives - Effect of Derivative Instruments on Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Effect of derivative instruments on results of operations    
Total amount of interest expense in which the effects of cash flow hedges are recorded $ 31,245 $ 29,665
Interest Rate Swaps    
Effect of derivative instruments on results of operations    
Pre-tax gain (loss) recognized in other comprehensive income (loss) (10) (7,573)
Pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense (1,271) (248)
Total amount of interest expense in which the effects of cash flow hedges are recorded $ 31,245 $ 29,665