Convertible Debt (Tables)

6 Months Ended

Jun. 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		Six Months Ended
	June 30,		June 30,
	2014	2013	2014	2013
Effective interest rate of 2013 convertible senior notes	NA	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	$202	$405	$463
Amortization of issuance costs	$11	$11	$21	$39