Segment Information (Details 3) - Segments [Domain] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Operating income (loss)
Gross profit	$ 171,743	$ 222,771	$ 358,785	$ 386,075
Assets elimination
Accounts receivable	816,522		816,522		$ 902,825
Other	87,670		87,670		97,529
Total assets	6,826,763	5,985,202	6,826,763	5,985,202	7,311,027
Liabilities elimination
Accounts payable	446,698		446,698		$ 511,056
Liabilities	3,902,063	3,025,992	3,902,063	3,025,992
Eliminations
Operating income (loss)
Gross profit	(4,500)	(1,400)	(600)	2,800
Assets elimination
Accounts receivable	(53,100)	(52,000)	(53,100)	(52,000)
Elimination of intra-company debt	(146,600)	(158,100)	(146,600)	(158,100)
Other	(9,600)	(10,700)	(9,600)	(10,700)
Total assets	(209,305)	(220,752)	(209,305)	(220,752)
Liabilities elimination
Accounts payable	(53,500)	(52,400)	(53,500)	(52,400)
Elimination of intra-company debt	(146,600)	(158,100)	(146,600)	(158,100)
Other	(500)	700	(500)	700
Liabilities	$ (200,626)	$ (209,776)	$ (200,626)	$ (209,776)