Segment Information (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Operating income (loss)
Gross profit reduction from intra-company sales	$ 201,264,000	$ 295,754,000
Assets elimination
Elimination of intra-company receivables	789,174,000		722,791,000
Other	131,543,000		134,264,000
Total assets	6,043,627,000	5,827,605,000	5,979,226,000
Liabilities elimination
Elimination of intra-company payables	472,257,000		420,824,000
Liabilities	3,637,142,000	3,599,911,000
Eliminations
Operating income (loss)
Gross profit reduction from intra-company sales	(2,100,000)	(20,000)
Assets elimination
Elimination of intra-company receivables	(27,900,000)	(42,000,000)
Elimination of intra-company debt	(149,600,000)	(147,400,000)
Other	(10,900,000)	(10,900,000)
Total assets	(188,429,000)	(200,289,000)
Liabilities elimination
Elimination of intra-company payables	(27,900,000)	(42,000,000)
Elimination of intra-company debt	(149,600,000)	(147,400,000)
Other liabilities	(1,100,000)	(600,000)
Liabilities	$ (178,607,000)	$ (190,018,000)