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Investments (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and December 31, 2015:
 
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair
Value
March 31, 2016:
(in thousands)
Current assets:
 
 
 
 
 
 
 
 Investments held to maturity
$
15,195

 
$
5

 
$
—

 
$
15,200

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
—

 
—

 
—

 
—

Total
$
15,195

 
$
5

 
$
—

 
$
15,200

 
 
 
 
 
 
 
 
December 31, 2015:
 

 
 

 
 

 
 

Current assets:
 

 
 

 
 

 
 

Investments held to maturity
$
12,444

 
$
—

 
$
(16
)
 
$
12,428

Non current assets:
 

 
 

 
 

 
 

Investments held to maturity
5,039

 
—

 
(17
)
 
5,022

Total
$
17,483

 
$
—

 
$
(33
)
 
$
17,450