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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities
(in thousands)
December 31, 2018
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
Municipal bonds
$
44,802

 
$
13

 
$
(110
)
 
$
44,705

Corporate bonds
48,499

 
23

 
(226
)
 
48,296

 
$
93,301

 
$
36

 
$
(336
)
 
$
93,001

(in thousands)
December 31, 2017
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
Municipal bonds
$
32,996

 
$
—

 
$
(148
)
 
$
32,848

Corporate bonds
28,757

 
1

 
(137
)
 
28,621

 
$
61,753

 
$
1

 
$
(285
)
 
$
61,469