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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]  
Investments Classified by Contractual Maturity Date [Table Text Block]
The schedule of maturities at December 31, 2013 and 2012 are as follows:
 
Maturities as of
December 31, 2013
 
Maturities as of
December 31, 2012
 
1 Year or Less
 
1 to 10 Years
 
1 Year or Less
 
1 to 10 Years
Corporate bonds
$
4,078

 
$
82,888

 
$
8,285

 
$
73,027

Certificates of deposit
16,513

 
8,379

 
8,000

 
8,175

Total
$
20,591

 
$
91,267

 
$
16,285

 
$
81,202