Statement Of Cash Flow Information (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Statement Of Cash Flow Information [Abstract]
Restricted cash and cash equivalents, noncurrent	$ 32,819,000		$ 33,741,000
Accruals for capital expenditures	$ 21,000,000	$ 36,000,000