Derivative Instruments and Hedging Activities Location of Gain Loss in Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments									$ 11,221	$ 14,447	$ 25,040
Sales and other revenues	$ 4,344,204	$ 4,770,799	$ 4,471,236	$ 4,128,427	$ 3,992,705	$ 3,719,247	$ 3,458,864	$ 3,080,483	17,714,666	14,251,299	10,535,700
Cost of products sold									13,940,782	11,467,873	8,766,027
Operating Expenses									1,285,838	1,296,669	1,021,152
Economic Hedges, Gain (Loss)									58,291	5,521	(6,133)
Commodity price swaps
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments									11,221	14,538	25,139
Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Economic Hedges, Gain (Loss)									16,655	(12,327)	(6,889)
Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
Economic Hedges, Gain (Loss)									0	(6,697)	7,276
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Economic Hedges, Gain (Loss)									(198)
Foreign Currency Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Economic Hedges, Gain (Loss)									41,834
Other Expense
Derivative Instruments, Gain (Loss) [Line Items]
Economic Hedges, Gain (Loss)									0	24,545	(6,520)
Interest Rate Contract
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments									0	(91)	(99)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Cost and Expense, Operating									(6,055)	(11,528)	(42,665)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Commodity price swaps
Derivative Instruments, Gain (Loss) [Line Items]
Sales and other revenues									(5,093)	7,836	(20,293)
Cost of products sold									0	(299)	0
Operating Expenses									(962)	(19,244)	(21,864)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense, Other									$ 0	$ 179	$ (508)