Segment Information (Details 3) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Operating income (loss)
Gross profit reduction from intra-company sales	$ 182,136,000	$ 276,386,000	$ 383,400,000	$ 572,140,000
Assets elimination
Elimination of intra-company receivables	715,440,000		715,440,000		722,791,000
Other	129,000,000		129,000,000		134,264,000
Total assets	5,971,380,000	5,900,453,000	5,971,380,000	5,900,453,000	5,979,226,000
Liabilities elimination
Elimination of intra-company payables	393,174,000		393,174,000		420,824,000
Liabilities	3,539,820,000	3,588,965,000	3,539,820,000	3,588,965,000
Eliminations
Operating income (loss)
Gross profit reduction from intra-company sales	1,000,000	(2,600,000)	(1,200,000)	(2,600,000)
Assets elimination
Elimination of intra-company receivables	(38,800,000)	(42,300,000)	(38,800,000)	(42,300,000)
Elimination of intra-company debt	170,600,000	(153,700,000)	170,600,000	(153,700,000)
Other	(13,500,000)	(15,000,000)	(13,500,000)	(15,000,000)
Total assets	(222,948,000)	(210,989,000)	(222,948,000)	(210,989,000)
Liabilities elimination
Elimination of intra-company payables	(41,200,000)	(43,800,000)	(41,200,000)	(43,800,000)
Elimination of intra-company debt	(170,600,000)	(153,700,000)	(170,600,000)	(153,700,000)
Other liabilities	(1,900,000)	(1,600,000)	(1,900,000)	(1,600,000)
Liabilities	$ (213,713,000)	$ (199,098,000)	$ (213,713,000)	$ (199,098,000)