Incentive Plans (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 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	380,586		132,803		67,182		—
Awards vested	(406,302	)	(181,131	)	(898	)	—
Options exercised	—		—		—		(32,098	)
Awards forfeited	(2,670	)	(6,356	)	—		—
Outstanding as of March 31, 2014	1,342,821		367,698		200,760		257,829