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Derivatives - Effect of Derivative Instruments on Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 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 $ 25,508 $ 25,221 $ 82,711 $ 80,664
Derivatives Designated as Hedging Instruments | Interest Rate Swaps        
Effect of derivative instruments on results of operations        
Pre-tax gain (loss) recognized in other comprehensive income (loss) (581) (87) (670) (8,399)
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Interest expense        
Effect of derivative instruments on results of operations        
Pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense (1,867) $ (1,271) (4,440) $ (2,594)
Derivatives Not Designated as Hedging Instruments | Interest Rate Swaps | Interest expense        
Effect of derivative instruments on results of operations        
Gain recognized in interest expense $ 532   $ 532