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MARKETABLE SECURITITES (Tables)
 6 Months Ended
Jun. 30, 2019
Marketable Securities [Abstract]  
Available-for-sale Securities
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at June 30, 2019, were as follows:
 
Amortized Cost
 
Gross Unrealized
 
Estimated Fair Market Value
(In thousands)
 
Gains
 
Losses
 
Investments due in 3 months or less:
 
 
 
 
 
 
 
Corporate securities
$
46,726

 
$
12

 
$
(11
)
 
$
46,727

Total
46,726

 
12

 
(11
)
 
46,727

Investments due in 4-12 months:
 
 
 
 
 
 
 
Corporate securities
44,829

 
213

 
(2
)
 
45,040

Total
44,829

 
213

 
(2
)
 
45,040

Investments due in 12 months or greater:
 
 
 
 
 
 
 
Corporate securities
38,395

 
118

 
(5
)
 
38,508

Total
38,395

 
118

 
(5
)
 
38,508

Total marketable securities
$
129,950

 
$
343

 
$
(18
)
 
$
130,275

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2018, were as follows:
 
Amortized Cost
 
Gross Unrealized
 
Estimated Fair Market Value
(In thousands)
 
Gains
 
Losses
 
Investments due in 3 months or less:
 
 
 
 
 
 
 
Corporate securities
$
6,788

 
$
—

 
$
(2
)
 
$
6,786

Total
6,788

 
—

 
(2
)
 
6,786

Investments due in 4-12 months:
 
 
 
 
 
 
 
Corporate securities
60,123

 
—

 
(244
)
 
59,879

Total
60,123

 
—

 
(244
)
 
59,879

Investments due in 12 months or greater:
 
 
 
 
 
 
 
Corporate securities
27,806

 
2

 
(22
)
 
27,786

Total
27,806

 
2

 
(22
)
 
27,786

Total marketable securities
$
94,717

 
$
2

 
$
(268
)
 
$
94,451