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Investments (Tables)
 6 Months Ended
Jun. 30, 2014
Investments [Abstract]  
Amortized Cost and Estimated Fair Value of Investments Held to Maturity
The following summarizes the amortized cost and estimated fair value of our investments held to maturity as of June 30, 2014 and December 31, 2013:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
June 30, 2014:
(in thousands)
Current assets:
 
 
 
 
 
 
 
 Investments held to maturity
$
19,097

 
$
30

 
$
—

 
$
19,127

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
5,682

 
—

 
(11
)
 
5,671

Total
$
24,779

 
$
30

 
$
(11
)
 
$
24,798

December 31, 2013:
 

 
 

 
 

 
 

Current assets:
 

 
 

 
 

 
 

Investments held to maturity
$
16,040

 
$
11

 
$
—

 
$
16,051

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
10,981

 
7

 
—

 
10,988

Total
$
27,021

 
$
18

 
$
—

 
$
27,039