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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Compensation Expense For Each Type Of Incentive Award
The following table reflects stock-based compensation expense recorded for each type of incentive award and the associated income tax benefit for the years ended December 31, 2013, 2012 and 2011:
 
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(in thousands)
Restricted stock-equity awards
$
56,165

 
$
48,876

 
$
32,861

Restricted stock-Liability Awards
40,404

 
22,419

 
10,882

Stock options (a)
2,952

 
4,110

 
2,936

Performance unit awards
9,131

 
6,162

 
4,500

Pioneer Southwest LTIP
1,029

 
1,098

 
761

Sendero Series B units
1,020

 
982

 
1,020

ESPP
1,731

 
2,437

 
125

Total
$
112,432

 
$
86,084

 
$
53,085

Income tax benefit
$
36,298

 
$
27,901

 
$
22,084

 _____________________
(a)
Cash proceeds received from stock option exercises during 2013, 2012 and 2011 amounted to $5.0 million, $3.1 million and $619 thousand, respectively.
Number Of Shares Available Under The Company's Long Term Incentive Plan
The following table shows the number of shares available for issuance pursuant to awards under the Company's LTIP at December 31, 2013:
 
Approved and authorized awards
9,100,000

Awards issued after May 3, 2006
(6,506,571
)
Awards available for future grant
2,593,429
Schedule Of Restricted Stock Award Activity
The following table reflects the restricted stock award activity for the year ended December 31, 2013:
 
 
Equity Awards
 
Liability Awards
 
Number of
Shares
 
Weighted
Average Grant-
Date Fair
Value
 
Number of Shares
Outstanding at beginning of year
1,512,762

 
$
96.22

 
405,916

Shares granted
433,311

 
$
134.58

 
250,641

Shares forfeited
(80,150
)
 
$
116.50

 
(35,813
)
Shares vested
(517,908
)
 
$
70.22

 
(198,362
)
Outstanding at end of year
1,348,015

 
$
117.09

 
422,382
Schedule Of Weighted-Average Assumptions To Estimate The Fair Value
The Company used the following weighted-average assumptions to estimate the fair value of stock options granted during the years ended December 31, 2012 and 2011:
 
 
2012
 
2011
Expected option life - years
7.0

 
7.0

Volatility
49.4
%
 
47.6
%
Risk-free interest rate
1.5
%
 
2.9
%
Dividend yield
0.4
%
 
0.4
%
Schedule Of Stock Options Awards Activity
A summary of the Company's nonstatutory stock option awards activity for the year ended December 31, 2013 is presented below:
 
 
Number
of Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic Value
 
 
 
 
 
(in years)
 
(in thousands)
Outstanding at beginning of year
467,486

 
$
59.63

 
 
 
 
Options expired and forfeited
(11,085
)
 
$
106.90

 
 
 
 
Options exercised
(166,474
)
 
$
29.88

 
 
 
 
Outstanding and expected to vest, at end of year
289,927

 
$
74.90

 
6.80
 
$
31,651

Exercisable at end of year
115,290

 
$
26.74

 
5.48
 
$
18,139
Schedule of Assumptions Used [Table Text Block]
The Company used the following assumptions to estimate the fair value of performance unit awards granted during 2013, 2012 and 2011:
 
 
2013
 
2012
 
2011
Risk-free interest rate
0.40%
 
0.40%
 
1.32%
Range of volatilities
30.4
%
-
42.9%
 
33.6
%
-
49.0%
 
50.2
%
-
84.1%
Schedule Of Performance Unit Activity
The following table summarizes the performance unit activity for the year ended December 31, 2013:
 
 
Number of
Units (a)
 
Weighted  Average
Grant-Date
Fair Value
Beginning performance unit awards
91,370

 
$
154.53

Units granted
94,917

 
$
189.23

Units forfeited
(10,842
)
 
$
172.02

Units vested (b)
(40,969
)
 
$
134.68

Ending performance unit awards
134,476

 
$
183.66

 _____________________
(a)
These amounts reflect the number of performance units granted. The actual payout of shares may be between zero percent and 250 percent of the performance units granted depending upon the total shareholder return ranking of the Company compared to peer companies at the vesting date.
(b)
On December 31, 2013, the service period lapsed on 40,969 of these performance unit awards. The lapsed units earned 2.5 shares for each vested award representing 102,424 aggregate shares of common stock issued on January 2, 2014.
Number Of Awards Available Under PSE Long Term Incentive Plan
The following table shows the number of Pioneer common shares available for issuance pursuant to awards under the PSE LTIP at December 31, 2013:
 
Awards approved and outstanding
678,034

Awards issued under the PSE LTIP (a)
(23,192
)
Awards available for future grant (b)
654,842

_____________________
(a)
Shares that represent outstanding awards originally granted under the Pioneer Southwest LTIP that have been assumed and adopted by the Company in connection with, and that continue to be outstanding after, the Pioneer Southwest merger.
(b)
Shares that have not been issued and are not subject to outstanding awards granted under the Pioneer Southwest LTIP.
Schedule Of PSE Restricted Stock Award Activity
The following table summarizes the activity of phantom unit awards issued under the Pioneer Southwest LTIP during 2013, which were converted to restricted stock units of the Company under the PSE LTIP based upon the Conversion Ratio:
 
Phantom Unit Awards
 
Number of
Awards (a)
 
Weighted
Average
Grant-Date
Fair Value
Outstanding awards at beginning of year
23,865

 
$
117.94

Units granted
7,492

 
$
110.32

Lapse of restrictions
(8,165
)
 
$
97.81

Outstanding awards at end of year
23,192

 
$
122.55


_____________________
(a)
Reflects the number of awards in Pioneer common stock after the Pioneer Southwest merger based upon the Conversion Ratio.
Schedule Of Employee Stock Purchase Plan
The following table shows the number of shares available for issuance under the ESPP at December 31, 2013:
 
Approved and authorized shares
1,250,000

Shares issued
(734,972
)
Shares available for future issuance
515,028