Convertible Debt (Tables)

9 Months Ended

Sep. 30, 2013

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,
	2013			2012			2013			2012
Effective interest rate of 2013 convertible senior notes	NA			3.73		%	3.73		%	3.73		%
Effective interest rate of 2015 convertible senior notes	4.50		%	4.50		%	4.50		%	4.50		%
Contractually stated interest costs	$	203		$	351		$	666		$	970
Amortization of issuance costs	$	11		$	131		$	50		$	352