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Fair Value (Tables)
 9 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The following table presents our financial assets and (liabilities) that are measured and reported at fair value in our Consolidated Balance Sheets on a recurring basis, by level within the fair value hierarchy (in thousands):
Fair Value at September 30, 2013
Level 1
 
Level 2
 
Level 3
Money market demand accounts and investment grade fixed income securities
$
9,483

 
$
—

 
$
—

 
 
 
 
 
 
Fair Value at December 31, 2012
Level 1
 
Level 2
 
Level 3
Money market demand accounts and investment grade fixed income securities
$
60,425

 
$
—

 
$
—