Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Tables)

v3.8.0.1
FAIR VALUE MEASUREMENTS (Tables)
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Available-for-sale Securities [Table Text Block] Available-for-sale investments included in cash equivalents at the end of each period were as follows (in thousands):
 
March 31, 2018
 
December 31, 2017
 
Adjusted Cost
 
Gross Unrealized Losses
 
Fair Value
 
Adjusted Cost
 
Gross Unrealized Losses
 
Fair Value
Municipal bonds and notes
$
5,155

 
$
(1
)
 
$
5,154

 
$
13,320

 
$
(1
)
 
$
13,319

Corporate debt securities
54,075

 
(36
)
 
54,039

 
49,432

 
(24
)
 
49,408

Financial institution instruments
15,653

 

 
15,653

 
10,881

 

 
10,881

Total available-for-sale investments
$
74,883

 
$
(37
)
 
$
74,846

 
$
73,633

 
$
(25
)
 
$
73,608