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Investments (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015 and December 31, 2014:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
March 31, 2015:
(in thousands)
Current assets:
 
 
 
 
 
 
 
 Investments held to maturity
$
4,984

 
$
9

 
$
—

 
$
4,993

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
1,993

 
—

 
(10
)
 
1,983

Total
$
6,977

 
$
9

 
$
(10
)
 
$
6,976

December 31, 2014:
 

 
 

 
 

 
 

Current assets:
 

 
 

 
 

 
 

Investments held to maturity
$
11,972

 
$
—

 
$
(7
)
 
$
11,965

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
4,015

 
—

 
(16
)
 
3,999

Total
$
15,987

 
$
—

 
$
(23
)
 
$
15,964