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MARKETABLE SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities
 
June 30, 2019
(in thousands)
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Municipal bonds
$
29,495

 
$
156

 
$
(5
)
 
$
29,646

Corporate bonds
29,620

 
291

 
(8
)
 
29,903

 
$
59,115

 
$
447

 
$
(13
)
 
$
59,549

 
December 31, 2018
(in thousands)
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