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Marketable Securities (Investments Available For Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Equity Securities:    
Fair Value $ 10,218 $ 11,250
Debt Securities:    
Fair Value 101,683 76,733
Cost Amount 114,398 88,570
Gross Unrealized Gains 126 568
Gross Unrealized (Losses) (2,623) (1,155)
Fair Value 111,901 87,983
SEI-sponsored mutual funds    
Equity Securities:    
Cost Amount 7,446 7,369
Gross Unrealized Gains 0 110
Gross Unrealized (Losses) (788) (143)
Fair Value 6,658 7,336
Equities and other mutual funds    
Equity Securities:    
Cost Amount 3,434 3,456
Gross Unrealized Gains 126 458
Gross Unrealized (Losses) 0 0
Fair Value 3,560 3,914
Debt securities    
Debt Securities:    
Cost Amount 103,518 77,745
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (1,835) (1,012)
Fair Value $ 101,683 $ 76,733