Segment Information (Details 3) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Operating income (loss)
Gross profit reduction from intra-company sales	$ 156,401,000	$ 199,243,000	$ 539,801,000	$ 771,383,000
Assets elimination
Elimination of intra-company receivables	712,750,000		712,750,000		722,791,000
Other	134,363,000		134,363,000		134,264,000
Total assets	5,775,516,000	6,003,481,000	5,775,516,000	6,003,481,000	5,979,226,000
Liabilities elimination
Elimination of intra-company payables	377,213,000		377,213,000		420,824,000
Liabilities	3,342,688,000	3,656,451,000	3,342,688,000	3,656,451,000
Eliminations
Operating income (loss)
Gross profit reduction from intra-company sales	(3,900,000)	4,700,000	(5,100,000)	2,100,000
Assets elimination
Elimination of intra-company receivables	(35,800,000)	(30,600,000)	(35,800,000)	(30,600,000)
Elimination of intra-company debt	(129,100,000)	(130,600,000)	(129,100,000)	(130,600,000)
Other	(17,100,000)	(14,100,000)	(17,100,000)	(14,100,000)
Total assets	(181,953,000)	(175,266,000)	(181,953,000)	(175,266,000)
Liabilities elimination
Elimination of intra-company payables	(39,000,000)	(35,900,000)	(39,000,000)	(35,900,000)
Elimination of intra-company debt	(129,100,000)	(130,600,000)	(129,100,000)	(130,600,000)
Other liabilities	(2,100,000)	200,000	(2,100,000)	200,000
Liabilities	$ (170,206,000)	$ (166,285,000)	$ (170,206,000)	$ (166,285,000)