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Investments (Tables)
 6 Months Ended
Jun. 30, 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
June 30, 2015 and December 31, 2014:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
June 30, 2015:
(in thousands)
Current assets:
 
 
 
 
 
 
 
 Investments held to maturity
$
6,101

 
$
—

 
$
(9
)
 
$
6,092

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
75

 
—

 
—

 
75

Total
$
6,176

 
$
—

 
$
(9
)
 
$
6,167

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