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Accumulated Other Comprehensive Income (Loss) (Narrative) (Details)
$ in Thousands, € in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2018
EUR (€)
May 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
May 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Feb. 28, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Recognition of accumulated other comprehensive income lodged taxes   $ 544,600   $ 544,583 $ 0  
Lodged tax effect           $ 544,600
Unrealized tax benefit from sale of available for sale portfolio, realized during period   $ 544,677 $ (42) $ 545,054 (37)  
German Plan | Pension Plan | Jefferies Bache Limited            
Defined Benefit Plan Disclosure [Line Items]            
Payment to transfer defined benefit obligation and insurance contracts | € € 6.5          
Reclassification adjustment from AOCI related to pension plan         $ 5,300