Segment Information - Eliminations Footnote (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Operating income (loss)
Operating income (loss)	$ 283,855	$ 131,029	$ 671,942	$ 308,359
Gross profit	408,503	228,726	1,024,922	587,511
Assets elimination
Accounts receivable	779,459		779,459		$ 613,605
Other	31,011		31,011		36,501
Total assets	6,787,562	6,842,541	6,787,562	6,842,541	$ 6,202,082
Eliminations
Operating income (loss)
Operating income (loss)	91	1,540	(9,055)	959
Assets elimination
Accounts receivable	(98,000)	(100,800)	(98,000)	(100,800)
Elimination of intra-company debt	(12,100)	(6,500)	(12,100)	(6,500)
Other	(12,500)	(6,600)	(12,500)	(6,600)
Total assets	$ (122,551)	$ (113,913)	$ (122,551)	$ (113,913)