Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2014

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Share Based Incentive Award Activity

The following table summarizes the activity that occurred during the nine months ended September 30, 2014, for each type of share-based incentive award issued by Pioneer:

	Restricted Stock Equity Awards		Restricted Stock Liability Awards		Performance Units		Stock Options
Outstanding as of December 31, 2013	1,371,207		422,382		134,476		289,927
Awards granted	406,617		140,093		67,182		—
Awards vested	(451,372	)	(200,408	)	(898	)	—
Options exercised	—		—		—		(90,869	)
Awards forfeited	(52,542	)	(25,534	)	(1,078	)	—
Outstanding as of September 30, 2014	1,273,910		336,533		199,682		199,058