Financial Instruments and Risk Management (Tables)

12 Months Ended

Dec. 31, 2014

Financial Instruments and Risk Management [Abstract]

Fair Value of Derivative Instruments Not Designated as Hedging Instruments

	December 31, 2014				December 31, 2013
	Asset Derivatives		Liability Derivatives		Asset Derivatives		Liability Derivatives
(Thousands of dollars)	Balance Sheet Location	Fair Value	Balance Sheet Location	Fair Value	Balance Sheet Location	Fair Value	Balance Sheet Location	Fair Value
Type of Derivative Contract
Commodity	Accounts Receivable	$ 23,168	–	–	Accounts Receivable	$ 1,970	–	–
Foreign exchange	–	–	Accounts Payable	$ 25	–	–	Accounts Payable	$ 1,038

Recognized Gains and Losses for Derivative Instruments Not Designated as Hedging Instruments

	Year Ended December 31, 2014			Year Ended December 31, 2013
(Thousands of dollars)	Location of Gain (Loss) Recognized in Income on Derivative	Amount of Gain (Loss) Recognized in Income on Derivative		Location of Gain (Loss) Recognized in Income on Derivative	Amount of Gain (Loss) Recognized in Income on Derivative
Type of Derivative Contract
Commodity	Sale and Other Operating Revenues	$	17,887	Sale and Other Operating Revenues	$	2,104
Commodity	–		–	Discontinued Operations		(1,604)
Foreign exchange	Interest and   Other Income		4,226	Interest and   Other Income		(5,162)
		$	22,113		$	(4,662)