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MARKETABLE SECURITITES
 6 Months Ended
Jun. 30, 2017
Marketable Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure
MARKETABLE SECURITIES:
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at June 30, 2017, were as follows:
 
Amortized
Cost
 
Gross Unrealized
 
Estimated Fair Market Value
(In thousands)
 
Gains
 
Losses
 
Investments due in 3 months or less:
 
 
 
 
 
 
 
Commercial paper
$
18,079

 
$
—

 
$
—

 
$
18,079

Corporate securities
24,463

 
—

 
(5
)
 
24,458

Total
42,542

 
—

 
(5
)
 
42,537

Investments due in 4-12 months:
 
 
 
 
 
 
 
Corporate securities
110,313

 
10

 
(88
)
 
110,235

Total
110,313

 
10

 
(88
)
 
110,235

Investments due in 12 months or greater:
 
 
 
 
 
 
 
Corporate securities
59,241

 
19

 
(52
)
 
59,208

Government securities
9,372

 
—

 
(6
)
 
9,366

Total
68,613

 
19

 
(58
)
 
68,574

Total marketable securities
$
221,468

 
$
29

 
$
(151
)
 
$
221,346

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2016, were as follows:
 
Amortized
Cost
 
Gross Unrealized
 
Estimated Fair Market Value
(In thousands)
 
Gains
 
Losses
 
Investments due in 3 months or less:
 
 
 
 
 
 
 
Commercial paper
$
36,996

 
$
—

 
$
—

 
$
36,996

Corporate securities
9,342

 
2

 
(2
)
 
9,342

Total
46,338

 
2

 
(2
)
 
46,338

Investments due in 4-12 months:
 
 
 
 
 
 
 
Commercial paper
19,186

 
—

 
—

 
19,186

Corporate securities
59,714

 
15

 
(76
)
 
59,653

Total
78,900

 
15

 
(76
)
 
78,839

Investments due in 12 months or greater:
 
 
 
 
 
 
 
Corporate securities
63,305

 
21

 
(180
)
 
63,146

Total
63,305

 
21

 
(180
)
 
63,146

Total marketable securities
$
188,543

 
$
38

 
$
(258
)
 
$
188,323


As of June 30, 2017, and December 31, 2016, the Company evaluated the nature of the investments with a loss position, which were primarily high-quality corporate and government securities, and determined the unrealized losses were not other-than-temporary.