Supplemental Information ( Additional Information) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accrued Liabilities [Abstract]
Accrued liabilities	$ 609,472		$ 537,483
Accrued rebates	110,862		72,187
Accrued Income Taxes	77,985		10,891
Accrued Liabilities Affiliates	30,609		$ 10,551
Increase (Decrease) in Capital Expenditure Accrual	$ 8,082	$ 23,878