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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
May 07, 2019
USD ($)
May 03, 2019
$ / shares
May 03, 2019
EUR (€)
shares
Mar. 31, 2019
£ / shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
EUR (€)
shares
Mar. 31, 2018
£ / shares
shares
Aug. 09, 2016
USD ($)
Dec. 31, 2015
shares
Subsequent Event [Line Items]                  
Distributable profits | $         $ 6,338,536        
Stock Repurchase Program, Authorized Amount | $               $ 300,000  
Common Stock, Par or Stated Value Per Share | (per share)   $ 0.001     $ 75.00   £ 0.10    
Preferred Stock, Shares Authorized         50,000,000 50,000,000 100,000    
Preferred Stock, Par or Stated Value Per Share | (per share)       £ 0.001 $ 0.001   £ 0.10    
Deferred Ordinary Shares         25,000 25,000      
Preferred Stock, Shares Issued         0 0 100,000   100,000
Equity [Member]                  
Subsequent Event [Line Items]                  
Stock Repurchase Program, Authorized Amount | $ $ 80,000                
Common Stock, Par or Stated Value Per Share | $ / shares   0.001              
Preferred Stock, Shares Authorized     50,000,000            
Preferred Stock, Par or Stated Value Per Share | $ / shares   $ 0.001              
Deferred Ordinary Shares     25,000            
Common Stock, Shares Authorized     500,000,000            
Euro Member Countries, Euro                  
Subsequent Event [Line Items]                  
Par Value (Euros) of Deferred Ordinary Shares | €           € 1.00      
Euro Member Countries, Euro | Equity [Member]                  
Subsequent Event [Line Items]                  
Par Value (Euros) of Deferred Ordinary Shares | €     € 1.00