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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Scheduled maturities of investments classified as available-for-sale
Scheduled maturities of investments classified as available-for-sale as of September 30, 2013 were as follows (in thousands):
Maturity
 
Fair Value
Due:
 
 
October 1, 2013 — September 30, 2014                                                                                                                
 
$
—

October 1, 2014 — September 30, 2018                                                                                                                
 
606

October 1, 2018 — September 30, 2023                                                                                                                
 
—

After September 30, 2023                                                                                                               
 
21,069

Available-for-sale investments                                                                                                                    
 
$
21,675
Schedule of available for sale securities reconciliation
As of September 30, 2013, the amortized cost basis and fair value of investments classified as available-for-sale were as follows (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
 Unrealized
Losses
 
Fair
Value
Auction rate securities
$
23,517

 
$
164

 
$
(2,006
)
 
$
21,675

Available-for-sale investments
$
23,517

 
$
164

 
$
(2,006
)
 
$
21,675


4.
INVESTMENTS — (CONTINUED)

As of December 31, 2012, the amortized cost basis and fair value of investments classified as available-for-sale were as follows (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Government-sponsored enterprise obligations
$
37

 
$
—

 
$
—

 
$
37

Auction rate securities
23,567

 
101

 
(2,006
)
 
21,662

Available-for-sale investments
$
23,604

 
$
101

 
$
(2,006
)
 
$
21,699
Schedule of unrealized loss on investments
The components of the Company’s investments in an unrealized loss position for twelve months or longer were as follows (in thousands):
 
September 30,
2013
 
December 31,
2012
 
Aggregate
Fair
 Value
 
Gross
Unrealized
Losses
 
Aggregate
Fair
 Value
 
Gross
Unrealized
Losses
Government-sponsored enterprise obligations
$
—

 
$
—

 
$
37

 
$
—

Auction rate securities
21,069

 
(2,006
)
 
21,119

 
(2,006
)
Investments in an unrealized loss position
$
21,069

 
$
(2,006
)
 
$
21,156

 
$
(2,006
)