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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2013
Financial Instruments And Marketable Securities [Abstract]  
Fair Value Hierarchy of Assets Measured on Recurring Basis
The following table presents the placement in the fair value hierarchy of assets that are measured at fair value on a recurring basis:
 
September 30, 2013:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
441

 
441

 

 

Total available-for-sale securities
$
441

 
441

 

 

 
December 31, 2012:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
354

 
354

 

 

Total available-for-sale securities
$
354

 
354

 

 

 
September 30, 2012:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
360

 
360

 

 

Government and agency securities
26,868

 
26,868

 

 

Total available-for-sale securities
$
27,228

 
27,228

 

 

Summary of Marketable Securities Treated as Available-for-Sale Securities
Marketable securities, all treated as available-for-sale securities, consist of the following:
 
September 30, 2013:
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
Common stock
$
197

 
244

 

 
441

Total available-for-sale securities
$
197

 
244

 

 
441

 
December 31, 2012:
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
Common stock
$
197

 
157

 

 
354

Total available-for-sale securities
$
197

 
157

 

 
354

 
September 30, 2012:
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
Common stock
$
197

 
163

 

 
360

Government and agency securities
26,868

 

 

 
26,868

Total available-for-sale securities
$
27,065

 
163

 

 
27,228

Summary of Future Maturities of Available-For-Sale Securities
Future maturities of our available-for-sale securities consist of the following:
 
 
Less than 12 months
 
Greater than 12 months
September 30, 2013:
Amortized
cost
 
Fair
value
 
Amortized
cost
 
Fair
value
Common stock
$
197

 
441

 

 

Total available-for-sale securities
$
197

 
441