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Derivative Financial Instruments - Cash Flow Hedges (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
derivative
Dec. 31, 2020
USD ($)
derivative
Dec. 31, 2019
USD ($)
derivative
Cash Flow Hedges      
Cash flow hedges      
Number of derivatives carried | derivative   0 0
Effect of cash flow hedging relationships      
Pretax gains recognized in other comprehensive income on derivatives (effective portion) $ 1,475    
Pretax gain reclassified from accumulated other comprehensive income (7,558)    
Interest rate swaps      
Cash flow hedges      
Recognized expenses related to the ineffective portion    
Interest rate swaps | Cash Flow Hedges      
Cash flow hedges      
Net interest expense on derivative $ 1,200    
Minimum | Interest rate swaps | Cash Flow Hedges      
Cash flow hedges      
Fixed interest rate (as a percent) 2.98%    
Maximum | Interest rate swaps | Cash Flow Hedges      
Cash flow hedges      
Fixed interest rate (as a percent) 3.03%    
Derivatives designated as hedging instruments | Interest rate swaps      
Cash flow hedges      
Notional amounts   $ 22,451 $ 23,190
Derivatives designated as hedging instruments | Interest rate swaps | Cash Flow Hedges      
Cash flow hedges      
Number of derivatives carried | derivative 2    
Notional amounts $ 150,000