Convertible Debt (Tables)

6 Months Ended

Jun. 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:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Effective interest rate	3.73		%	3.64		%	3.73		%	3.64		%
Contractually stated interest costs	$	309		$	344		$	618		$	688
Amortization of interest costs	$	111		$	112		$	221		$	224