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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Marketable Securities [Abstract]  
Investments Available For Sale Investments available for sale classified as non-current assets consist of: 
 
At March 31, 2019
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,429

 
$
77

 
$
(384
)
 
$
7,122

Equities and other mutual funds
3,475

 
514

 
—

 
3,989

Debt securities
99,401

 
—

 
(688
)
 
98,713

 
$
110,305

 
$
591

 
$
(1,072
)
 
$
109,824

 
At December 31, 2018
 
Cost
Amount
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
$
7,446

 
$
—

 
$
(788
)
 
$
6,658

Equities and other mutual funds
3,434

 
126

 
—

 
3,560

Debt securities
103,518

 
—

 
(1,835
)
 
101,683

 
$
114,398

 
$
126

 
$
(2,623
)
 
$
111,901