Supplemental Cash Flow Information (Components Of Change In Other Assets And Liabilities, Net) (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Supplemental Cash Flow Information
Other current and noncurrent assets	$ 106	$ (19)
Accrued salaries, benefits and payroll taxes	(6,171)	(742)
Accrued insurance and other taxes	4,978	4,528
Accrued income taxes	8,093	15,326
Accrued pension, postretirement and postemployment benefits	833	2,836
Other current and noncurrent liabilities	(3,402)	(8,815)
Other assets and liabilities, net	$ 4,437	$ 13,114