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Derivatives - Effect of Derivative Instruments on Statements of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effect of derivative instruments on results of operations      
Total amount of interest expense in which the effects of cash flow hedges are recorded $ 105,716 $ 104,681 $ 93,328
Interest Rate Swaps      
Effect of derivative instruments on results of operations      
Pre-tax gain (loss) recognized in other comprehensive income (loss) (8,459) (6,785) 3,512
Pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense (3,878) 2,278 617
Total amount of interest expense in which the effects of cash flow hedges are recorded $ 105,716 $ 104,681 $ 93,328