Segment Information (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Operating income (loss)
Gross profit increase from intra-company sales	$ 163,304,000	$ 176,264,000
Assets elimination
Elimination of intra-company receivables	811,100,000		720,600,000
Other	78,152,000		115,083,000
Total assets	5,913,857,000	5,956,574,000	5,933,006,000
Liabilities elimination
Elimination of intra-company payables	417,168,000		414,932,000
Liabilities	3,279,527,000	3,450,570,000
Eliminations
Operating income (loss)
Gross profit increase from intra-company sales	4,200,000	1,700,000
Assets elimination
Elimination of intra-company receivables	(65,100,000)	(49,400,000)
Elimination of intra-company debt	(153,800,000)	(156,000,000)
Other	(9,300,000)	(10,900,000)
Total assets	(228,175,000)	(216,259,000)
Liabilities elimination
Elimination of intra-company payables	(65,500,000)	(49,700,000)
Elimination of intra-company debt	(153,800,000)	(156,000,000)
Other liabilities	1,200,000	200,000
Liabilities	$ (218,081,000)	$ (205,527,000)