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Derivative Instruments (Narrative) (Details)
£ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
derivative
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
instrument
Jul. 01, 2016
instrument
Jun. 30, 2016
USD ($)
Derivative [Line Items]            
Gain (loss) to be reclassified within twelve months $ 1,600,000          
Notional Amount 479,825,000 $ 783,125,000        
Excess proceeds from forward contract settlement 0 0 $ 63,956,000      
Interest Rate Swap            
Derivative [Line Items]            
Impact from netting arrangements $ 0          
Derivatives in liability positions | derivative 0          
Not Designated as Hedging Instrument | Foreign Exchange Forward            
Derivative [Line Items]            
Fair value of derivatives           $ 37,800,000
Designated as Hedging Instrument | Foreign Exchange Forward            
Derivative [Line Items]            
Number of forward contracts | instrument       4 4  
Notional Amount | £       £ 357.3    
Excess proceeds from forward contract settlement $ 64,000,000.0          
Amount of AOCI to remain in AOCI 26,200,000          
Level 3 | Recurring basis            
Derivative [Line Items]            
Derivative Asset $ 0 $ 0