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Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Amounts Recognized in Financial Statements with Respect to Share-Based Plans

Amounts recognized in the financial statements by the Company with respect to all share-based plans are shown in the following table.  All expense prior to August 30, 2013 was incurred under the 2007 Plan and the 2012 Plan while all amounts after August 30, 2013 were incurred in the MUSA 2013 Plan and the Directors Plan.

		December 31,
(Thousands of dollars)		2015				2014				2013
Compensation charged against income before income tax benefit		$	9,015			$	10,435			$	9,391
Related income tax benefit recognized in income		$	3,155			$	3,652			$	3,287

Summary of Changes in Stock Options Outstanding

Changes in options outstanding for Company employees during the period from August 30, 2013 to December 31, 2015 are presented in the following table:

	Number of Shares			Average Exercise Price
Outstanding at December 31, 2013	621,149			$	35.13
Granted at FMV	127,400			39.46
Exercised	(74,766	)		34.21
Forfeited	(13,148	)		38.36
Outstanding at December 31, 2014	660,635			36.00
Granted at FMV	72,350			70.57
Exercised	(236,620	)		33.80
Forfeited	(30,609	)		40.21
Outstanding at December 31, 2015	465,756			$	42.22
Exercisable at December 31, 2014	88,445			$	34.54
Exercisable at December 31, 2015	127,077			$	36.71

Summary of Additional Stock Option Information

Additional information about stock options outstanding at December 31, 2015 is shown below: 

		Options Outstanding									Options Exercisable
Range of Exercise Prices per Option		No. of Options			Avg. Life Remaining in Years		Aggregate Intrinsic Value				No. of Options			Avg. Life Remaining in Years		Aggregate Intrinsic Value
$32.53 to $37.06		171,592			3.9		$	4,614,797			62,213			3.5		$	1,707,361
$37.07 to $39.45		5,615			2.0		132,891				5,615			2.0		132,891
$39.46 to $40.25		218,899			4.6		4,564,023				59,249			4.1		1,213,745
$40.26 to $70.57		69,650			6.1		—				—			0.0		—
		465,756			4.5		$	9,311,711			127,077			3.7		$	3,053,997

MUSA 2013 Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Valuation Assumptions

Following are the assumptions used by the Company to value the original awards:

	Year Ended December 31,
	2015			2014
Fair value per option grant	$	20.18		$	11.44
Assumptions
Dividend yield	—			—
Expected volatility	29.3		%	31.7		%
Risk-free interest rate	1.52		%	1.37		%
Expected life	5.0 years			4.6 years

Murphy Oil Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Valuation Assumptions

Following are the assumptions used originally by Murphy Oil to value the original awards.

	Years Ended December 31,
	2012 and 2011
Fair value per option grant	12.37 - 20.34
Assumptions
Dividend yield	1.80% - 2.27%
Expected volatility	37.00% - 39.62%
Risk-free interest rate	0.55% - 2.10%
Expected life	4.00 yrs. - 5.20 yrs.

Restricted Stock Units [Member] | MUSA 2013 Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Restricted Stock Unit Activity

(Number of units)	Employee RSU's
Outstanding at December 31, 2012	—
Granted	352,522
Vested and issued	(509	)
Forfeited	(4,915	)
Outstanding at December 31, 2013	347,098
Granted	93,025
Vested and issued	(20,680	)
Forfeited	(22,428	)
Outstanding at December 31, 2014	397,015
Granted	55,450
Vested and issued	(66,116	)
Forfeited	(30,049	)
Outstanding at December 31, 2015	356,300

Restricted Stock Units [Member] | 2013 Stock Plan For Non-Employee Directors [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Restricted Stock Unit Activity

(Number of units)	Director RSU's
Outstanding at December 31, 2012	—
Granted	28,413
Vested and issued	—
Forfeited	—
Outstanding at December 31, 2013	28,413
Granted	22,437
Vested and issued	—
Forfeited	—
Outstanding at December 31, 2014	50,850
Granted	12,924
Vested and issued	—
Forfeited	—
Outstanding at December 31, 2015	63,774

Performance Units [Member] | MUSA 2013 Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Restricted Stock Unit Activity

(Number of units)	Employee PSU's
Outstanding at December 31, 2013	—
Granted	78,500
Vested and issued	—
Forfeited	(6,500	)
Outstanding at December 31, 2014	72,000
Granted	40,400
Vested and issued	—
Forfeited	(10,006	)
Outstanding at December 31, 2015	102,394

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