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Stockholders' Equity, Stock-Based Compensation, Performance Share Units and Noncontrolling Interests (Tables)
 6 Months Ended
Jun. 30, 2013
Text Block [Abstract]  
Common Stock
The following is a summary of the changes in our common shares issued for the six months ended June 30, 2013 and 2012:
 
 
Six Months Ended
June 30,
 
 
2013
 
2012
 
 
(in thousands)
Shares issued as of January 1
 
666,468

 
660,888

Restricted stock issuances (net of forfeitures)(a)
 
2,138

 
3,063

Stock option exercises
 
313

 
244

Shares issued as of June 30
 
668,919

 
664,195
Preferred Stock
The following reflects the shares outstanding and liquidation preference of our preferred shares for the six months ended June 30, 2013 and 2012: 
 
 
5.75%
 
5.75% (A)
 
4.50%
 
5.00%
(2005B)  
 
Total
Shares outstanding as of January 1, 2013
and 2012 and June 30, 2013 and 2012
(in thousands)
 
1,497

 
1,100

 
2,559

 
2,096

 
7,252

 
 
 
 
 
 
 
 
 
 
 
Liquidation preference per share
 
$
1,000

 
$
1,000

 
$
100

 
$
100

 
 
Stock-Based Compensation
We recorded the following stock-based compensation during the Current Quarter, the Prior Quarter, the Current Period and the Prior Period:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
($ in millions)
Natural gas and oil properties
 
$
12

 
$
18

 
$
32

 
$
38

General and administrative expenses
 
15

 
20

 
35

 
38

Natural gas, oil and NGL production expenses
 
6

 
5

 
12

 
12

Marketing, gathering and compression expenses
 
1

 
4

 
4

 
8

Oilfield services expenses
 
2

 
2

 
5

 
5

Total
 
$
36

 
$
49

 
$
88

 
$
101
Restricted Stock
A summary of the changes in unvested shares during the six months ended June 30, 2013 is presented below.
 
 
Number of
Unvested
Restricted Shares
 
Weighted Average
Grant-Date
Fair Value
 
 
(in thousands)
 
 
Unvested shares as of January 1, 2013
 
18,899

 
$
23.72

Granted
 
5,390

 
$
18.12

Vested
 
(6,223
)
 
$
23.82

Forfeited
 
(889
)
 
$
21.76

Unvested shares as of June 30, 2013
 
17,177

 
$
22.04
Stock Option Activity
The following table provides information related to stock option activity for the six months ended June 30, 2013: 
 
 
Number of
Shares
Underlying  
Options
 
Weighted
Average
Exercise
Price
Per Share
 
Weighted  
Average
Contract
Life in
Years
 
Aggregate  
Intrinsic
Value(a)
 
 
(in thousands)
 
 
 
 
 
($ in millions)
Outstanding at January 1, 2013
 
481

 
$
12.69

 
0.96
 
$
2

Granted
 
5,187

 
$
19.22

 
 
 
 
Exercised
 
(336
)
 
$
10.81

 
 
 


Expired
 
(12
)
 
$
22.49

 
 
 
 
Outstanding at June 30, 2013
 
5,320

 
$
19.15

 
9.42
 
$
7

 
 
 
 
 
 
 
 
 
Exercisable at June 30, 2013
 
357

 
$
18.08

 
6.47
 
$
1
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table presents a summary of our PSU awards as of June 30, 2013:
 
 
Units
 
Fair Value
as of
Grant-Date
 
Fair Value
 
Liability for
Vested
Amount
 
 
 
 
($ in millions)
2012 Awards
 
 
 
 
 
 
 
 
Payable 2014
 
278,084

 
$
8

 
$
5

 
$
5

Payable 2015
 
834,246

 
23

 
17

 
15

Total 2012 Awards
 
1,112,330

 
$
31

 
$
22

 
$
20

 
 
 
 
 
 
 
 
 
2013 Awards
 
 
 
 
 
 
 
 
Payable 2016
 
1,636,572

 
$
35

 
$
39

 
$
26
Distributions Made to Limited Partner, by Distribution [Table Text Block]
For the Current Period and Prior Period, the Trust declared and paid the following distributions.
Production Period
 
Distribution Date
 
Cash Distribution
per
Common Unit
 
Cash Distribution
per
Subordinated Unit
December 2012 - February 2013
 
May 31, 2013
 
$
0.6900

 
$
0.3010

September 2012 - November 2012
 
March 1, 2013
 
$
0.6700

 
$
0.3772

December 2011 - February 2012
 
May 31, 2012
 
$
0.6588

 
$
0.6588

September 2011 - November 2011
 
March 1, 2012
 
$
0.7277

 
$
0.7277