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Investments in Available-for-Sale Securities (Tables)
6 Months Ended
Jun. 30, 2013
Available-for-sale Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
The Company's investments in available-for-sale marketable securities are as follows:
 
June 30, 2013
 
 
 
 
 
 
 
 
 
Balance Sheet
 
 
 
Gross
 
Gross
 
 
 
Classification
 
 
 
Unrealized
 
Unrealized
 
Fair
 
Short-Term
 
Other
 
Cost Basis
 
Gains
 
Losses
 
Value
 
Investments
 
Assets
 
(In thousands)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency securities
$
126,193

 
$

 
$
(459
)
 
$
125,734

 
$
125,734

 
$

Corporate notes and bonds
123,692

 

 
(962
)
 
122,730

 
122,730

 

Equity securities
5,271

 
10,108

 
(2,907
)
 
12,472

 

 
12,472

Total Investments
$
255,156

 
$
10,108

 
$
(4,328
)
 
$
260,936

 
$
248,464

 
$
12,472

 
 
 
 
 
 
 
 
 
 
 
 

 
December 31, 2012
 
 
 
 
 
 
 
 
 
Balance Sheet
 
 
 
Gross
 
Gross
 
 
 
Classification
 
 
 
Unrealized
 
Unrealized
 
Fair
 
Short-Term
 
Other
 
Cost Basis
 
Gains
 
Losses
 
Value
 
Investments
 
Assets
 
(In thousands)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency securities
$
146,993

 
$
2

 
$
(412
)
 
$
146,583

 
$
146,583

 
$

Corporate notes and bonds
88,118

 

 
(396
)
 
87,722

 
87,722

 

Equity securities
5,271

 
2,704

 
(2,628
)
 
5,347

 

 
5,347

Total Investments
$
240,382

 
$
2,706

 
$
(3,436
)
 
$
239,652

 
$
234,305

 
$
5,347