Convertible Debt (Tables)

9 Months Ended

Sep. 30, 2012

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 convertible senior notes:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Effective interest rate of 2013 senior notes	3.73		%	3.64		%	3.73		%	3.64		%
Effective interest rate of 2015 senior notes	4.50		%	NA			4.50		%	NA
Contractually stated interest costs	$	351		$	344		$	970		$	1,032
Amortization of interest costs	$	131		$	112		$	352		$	336