Supplemental Cash Flow Information (Components Of Change In Other Assets And Liabilities, Net) (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Supplemental Cash Flow Information
Other current and noncurrent assets	$ 2,325	$ 3,108
Accrued salaries, benefits and payroll taxes	(2,324)	(2,237)
Accrued insurance and other taxes	8,366	8,134
Accrued income taxes	22,208	11,177
Accrued pension, postretirement and postemployment benefits	(16,046)	(10,849)
Other current and noncurrent liabilities	10,450	3,306
Other assets and liabilities, net	$ 24,979	$ 12,639