Cash And Cash Equivalents (Net Cash Provided By Operating Activities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash and Cash Equivalents [Abstract]
Accounts receivable	$ (35,024)	$ 10,469
Accounts receivable from related companies	(57,282)	(24,685)
Inventories	23,050	65,950
Exchanges receivable	7,222	5,330
Other current assets	54,503	(34,575)
Other non-current assets, net	2,447	2,353
Accounts payable	(15,352)	(35,787)
Accounts payable to related companies	75,619	(6,094)
Exchanges payable	(8,865)	4,846
Accrued and other current liabilities	(65,749)	(55,534)
Other non-current liabilities	(5,911)	2,335
Price risk management assets and liabilities, net	(9,064)	(6,441)
Net change in operating assets and liabilities, net of effects of acquisitions	$ (34,406)	$ (71,833)