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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Marketable Securities [Abstract]  
Investments Available For Sale
Investments available for sale classified as non-current assets consist of:
 
 
At December 31, 2016
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
7,357

 
$
24

 
$
(996
)
 
$
6,385

Equities and other mutual funds
 
2,968

 
228

 
—

 
3,196

Debt securities
 
74,843

 
—

 
(391
)
 
74,452

 
 
$
85,168

 
$
252

 
$
(1,387
)
 
$
84,033


 
 
At December 31, 2015
 
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
SEI-sponsored mutual funds
 
$
8,474

 
$
—

 
$
(742
)
 
$
7,732

Equities and other mutual funds
 
2,857

 
68

 
—

 
2,925

Debt securities
 
70,308

 
329

 
—

 
70,637

 
 
$
81,639

 
$
397

 
$
(742
)
 
$
81,294