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Marketable Securities
 12 Months Ended
Dec. 31, 2016
Marketable Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Marketable Securities:
The Company has evaluated its investment policies and determined that all of its investment securities are to be classified as available-for-sale.  Available-for-sale securities are carried at fair value, with the unrealized gains and losses reported in Stockholders’ Equity under the caption “Accumulated other comprehensive loss.”  Realized gains and losses on available-for-sale securities are included in “Other expense (income).”  The Company records other-than-temporary impairment charges for its available-for-sale investments when it intends to sell the securities, it is more-likely-than not that it will be required to sell the securities before a recovery, or when it does not expect to recover the entire amortized cost basis of the securities.  The cost of securities sold is based on the specific identification method.
The Company has determined that the gross unrealized losses on its marketable securities at December 31, 2016 and 2015 are temporary in nature. The Company reviews its investment portfolio to identify and evaluate investments that have indications of possible impairment. Factors considered in determining whether a loss is other-than-temporary include the length of time and extent to which fair value has been less than the cost basis, credit quality and the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value.
At December 31, 2016 and 2015, marketable securities are categorized as follows:
 
Amortized Cost

Gross Unrealized Holding Gains

Gross Unrealized Holding Losses

Fair Value
December 31, 2016
 


 


 


 

Municipal notes and bonds
$
87,088


$
6


$
(65
)

$
87,029

Corporate bonds
842


1


—


843

Total marketable securities
$
87,930


$
7


$
(65
)

$
87,872

 
 
 
 
 
 
 
 
December 31, 2015
 


 


 


 

Municipal notes and bonds
$
116,086


$
18


$
(15
)

$
116,089

Corporate bonds
838

 
—

 
(3
)
 
835

Total marketable securities
$
116,924


$
18


$
(18
)

$
116,924


The amortized cost and estimated fair value of marketable securities classified by the maturity date listed on the security, regardless of the Consolidated Balance Sheet classification, is as follows at December 31, 2016 and 2015:

 
December 31, 2016

December 31, 2015
 
Amortized
Cost

Fair
Value

Amortized
Cost

Fair
Value
Due within one year
$
82,498


$
82,445


$
113,542


$
113,549

Due after one through five years
5,431


5,427


3,382


3,375

Due after five through ten years
—


—


—


—

Due after ten years
—


—


—


—

Total marketable securities
$
87,929


$
87,872


$
116,924


$
116,924



The following table summarizes the estimated fair value and gross unrealized holding losses of marketable securities, aggregated by investment instrument and period of time in an unrealized loss position at December 31, 2016 and 2015.
 
In Unrealized Loss Position
For Less Than 12 Months

In Unrealized Loss Position
For Greater Than 12 Months
 
Fair
Value

Gross
Unrealized
Losses

Fair
Value

Gross
Unrealized
Losses
December 31, 2016
 


 


 


 

Municipal notes and bonds
$
64,918


$
(65
)

$
—


$
—

Corporate bonds
—


—


—


—

Total marketable securities
$
64,918


$
(65
)

$
—


$
—

December 31, 2015
 


 


 


 

Municipal notes and bonds
$
52,638


$
(15
)

$
305


$
(1
)
Corporate bonds
835

 
(3
)
 
—

 
—

Total marketable securities
$
53,473


$
(18
)

$
305


$
(1
)

See Note 3 for additional discussion regarding the fair value of the Company’s marketable securities.