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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]  
Investments Classified by Contractual Maturity Date [Table Text Block]
The schedule of maturities at December 31, 2012 and 2011 are as follows:
 
Maturities as of
December 31, 2012
 
Maturities as of
December 31, 2011
 
1 Year or Less
 
1 to 10 Years
 
1 Year or Less
 
1 to 8 Years
Corporate bonds
$
8,285

 
$
73,027

 
$
5,659

 
$
63,965

Certificates of deposit
8,000

 
8,175

 
—

 
8,039

Total
$
16,285

 
$
81,202

 
$
5,659

 
$
72,004