Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2012		2011		2012		2011
Stock-based compensation expense recognized as part of selling, general and administrative expense	$	1,456	$	1,467	$	2,990	$	2,878