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Derivative and Other Fair Value Instruments - Additional Information (Details)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2019
USD ($)
DerivativeInstrument
Jun. 30, 2019
USD ($)
DerivativeInstrument
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Derivative [Line Items]        
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)     $ 84,100 $ 65,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net     25,600  
Number of interest rate swaps matured | DerivativeInstrument 6      
Repayments of unsecured debt     $ 450,000  
2.375% Notes [Member]        
Derivative [Line Items]        
Repayments of unsecured debt $ 450,000      
Debt instrument, interest rate, stated percentage 2.375%      
Forward Starting Swaps [Member]        
Derivative [Line Items]        
Forward starting swaps settled | DerivativeInstrument   10    
Debt instrument, term   10 years    
Proceeds from settlement of derivative instruments   $ 41,800    
Public notes, face value   600,000    
Interest expense   200    
Increase (decrease) in charges hedge termination activities   $ 41,600