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Investments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2014 and December 31, 2013:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
March 31, 2014:
(in thousands)
Current assets:
 
 
 
 
 
 
 
 Investments held to maturity
$
22,808

 
$
31

 
$
—

 
$
22,839

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
1,027

 
1

 
—

 
1,028

Total
$
23,835

 
$
32

 
$
—

 
$
23,867

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