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Derivative Financial Instruments - Derivative Instruments Designated as Cash Flow Hedges (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 04, 2020
USD ($)
Jun. 30, 2020
USD ($)
swap_agreement
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
swap_agreement
Jun. 30, 2019
USD ($)
Feb. 25, 2020
USD ($)
treasury_lock
Feb. 24, 2020
USD ($)
Derivative [Line Items]              
Impact of settlement of forward-starting interest rate swap   $ 1,455 $ 4,577 $ 15,386 $ 5,301    
Derivatives in net liability position   16,000   16,000      
Treasury lock              
Derivative [Line Items]              
Number of instruments | treasury_lock           2  
Notional amount           $ 40,000 $ 75,000
Impact of settlement of forward-starting interest rate swap $ 4,300 0   (4,267) 0    
Term of senior notes 10 years            
Settled interest rate swaps              
Derivative [Line Items]              
Impact of settlement of forward-starting interest rate swap   (1,455) $ (4,577) (11,119) $ (5,301)    
Active Interest Rate Swap              
Derivative [Line Items]              
Interest rate cash flow hedge gain (loss) to be reclassified to interest expense during the next 12 months   $ 4,400   $ 4,400      
Cash flow hedging | Designated as hedging instrument | Settled interest rate swaps              
Derivative [Line Items]              
Number of instruments | swap_agreement   8   8      
Notional amount   $ 175,000   $ 175,000