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Convertible Debt (Tables)
 9 Months Ended
Sep. 30, 2014
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
The following table outlines the effective interest rate, contractually stated interest costs, and costs related to the amortization of issuance costs for the Company's 2013 and 2015 convertible senior notes:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2014
 
2013
 
2014
 
2013
Effective interest rate of 2013 convertible senior notes
N/A
 
N/A
 
N/A
 
3.73%
Effective interest rate of 2015 convertible senior notes
4.50%
 
4.50%
 
4.50%
 
4.50%
Contractually stated interest costs
$203
 
$203
 
$608
 
$666
Amortization of issuance costs
$11
 
$11
 
$32
 
$50