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Fair Value Measurement (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value, Measurement Inputs, Disclosure [Text Block]
 
  
 
Fair value measurements at December 31, 2015 using
 
Total carrying
value
 
Quoted prices
in active
markets for
identical
assets (level 1)
 
Significant
other
observable
inputs (level 2)
 
Significant
unobservable
inputs (level 3)
Short-term available for sale securities
$
41,233

 
$
8,785

 
$
32,448

 
$
—

Total available for sale securities
$
41,233

 
$
8,785

 
$
32,448

 
$
—