Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Restricted Stock Awards and Stock Options

For restricted stock awards and stock options, we had:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
	(In millions)
Recognized stock compensation expense	$	3.2	$	1.9	$	9.0	$	7.2
Capitalized stock compensation cost for our oil and natural gas properties	0.5		0.4		1.3		1.6
Tax benefit on stock based compensation	1.2		0.7		3.4		2.7

Schedule of Fair Value of the Restricted Stock Awards Granted During the Periods

The following table shows the fair value of restricted stock awards granted to employees and non-employee directors during the periods indicated:

	Nine Months Ended						Nine Months Ended
	September 30, 2017						September 30, 2016
	Time Vested			Performance Vested			Time Vested			Performance Vested
Shares granted:
Employees	475,799			173,373			486,578			152,373
Non-employee directors	49,104			—			90,000			—
	524,903			173,373			576,578			152,373
Estimated fair value (in millions):(1)
Employees	$	11.8		$	4.5		$	2.6		$	0.8
Non-employee directors	0.9			—			0.9			—
	$	12.7		$	4.5		$	3.5		$	0.8
Percentage of shares granted expected to be distributed:
Employees	95		%	91		%	94		%	89		%
Non-employee directors	100		%	N/A			100		%	N/A

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(1) Represents 100% of the grant date fair value. (We recognize the grant date fair value minus estimated forfeitures.)