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Derivative Instruments (Effect of Derivatives on Condensed Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Interest expense, net [1] $ 7,882 $ 9,356 $ 13,346 $ 15,016
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives designated in fair value hedging   (50) (183) (86)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives designated in fair value hedging [2]   (50) (18) (86)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Debt Extinguishment [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives designated in fair value hedging     (165)  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income recognized in other comprehensive income, net of tax (10,598) 1,056 (19,192) 64
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Loss reclassified from accumulated other comprehensive income [2] $ (181) $ (193) $ (262) $ (195)
[1] Bond discounts and deferred loan fees are reported within interest expense, net on the Condensed Consolidated Statements of Income.
[2] Realized gain (loss) on hedging instruments consist of net cash settlements and interest accruals on interest rate swaps during the periods.