Statement Of Cash Flow Information (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Statement Of Cash Flow Information
Restricted cash and cash equivalents, noncurrent	$ 34,636,000		$ 35,339,000
Accruals for capital expenditures	$ 34,800,000	$ 17,500,000