Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Information [Abstract]

Summary of supplemental cash flow information

Supplemental cash flow information for each of the three years in the period ended December 31, 2012 is as follows:

	2012		2011		2010
Supplemental cash flow information:
Interest paid, net of amounts capitalized	$	68,051	$	68,607	$	71,993
Income taxes paid, net of refunds	$	8,448	$	26,983	$	26,061