Supplementary Cash Flow Disclosures (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Information Abstract

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

		Year Ended December 31,
		2012		2011		2010
Interest paid	$	66,365	$	31,928	$	18,668
Income taxes paid (refunded)	$	426	$	9,427	$	(172)