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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2020
Marketable Securities [Abstract]  
Investments Available For Sale
Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of: 
 At June 30, 2020
 Cost
Amount		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair
Value
Available-for-sale debt securities$91,666  $2,501  $—  $94,167  
SEI-sponsored mutual funds7,514  72  (594) 6,992  
Equities and other mutual funds3,600  602  —  4,202  
$102,780  $3,175  $(594) $105,361  
 At December 31, 2019
 Cost
Amount		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair
Value
Available-for-sale debt securities$104,193  $605  $—  $104,798  
SEI-sponsored mutual funds7,564  125  (39) 7,650  
Equities and other mutual funds3,637  832  —  4,469  
$115,394  $1,562  $(39) $116,917