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Stock Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2012
Stock Compensation Plans [Line Items]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Stock-based compensation costs for the years ended December 31, 2012, 2011 and 2010, are as follows:
 
 
Year Ended December 31,
In thousands
 
2012
 
2011
 
2010
Stock-based compensation expensed:
 
 
 
 
 
 
General and administrative expenses
 
$
26,463

 
$
30,256

 
$
28,169

Lease operating expenses
 
2,847

 
2,621

 
2,056

Transaction and other costs related to the Encore Merger
 

 
313

 
5,866

Total stock-based compensation expensed
 
29,310

 
33,190

 
36,091

Stock-based compensation capitalized
 
8,587

 
6,998

 
3,702

Total cost of stock-based compensation arrangements
 
$
37,897

 
$
40,188

 
$
39,793

 
 
 
 
 
 
 
Income tax benefit realized for stock-based compensation arrangements
 
$
15,131

 
$
18,383

 
$
8,462

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
2012
 
2011
 
2010
Weighted average fair value of SARs granted
 
$
8.90

 
$
9.68

 
$
8.45

Risk-free interest rate
 
0.79
%
 
1.74
%
 
2.19
%
Expected life
 
4.0 to 5.0 years

 
4.0 to 5.0 years

 
4.0 to 4.3 years

Expected volatility
 
64.9
%
 
63.3
%
 
65.0
%
Dividend yield
 
%
 
%
 
%
  
Summary of stock option and SARs activity
The following is a summary of our stock option and SARs activity:
 
 
Number
of Awards
 
Weighted
Average
Exercise Price
 
Weighted Average Remaining Contractual Life
(in years)
 
Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 2011
 
11,949,610

 
$
13.56

 
 
 
 
Granted
 
1,066,294

 
17.14

 
 
 
 
Exercised
 
(2,029,570
)
 
8.03

 
 
 
 
Forfeited or expired
 
(541,199
)
 
18.34

 
 
 
 
Outstanding at December 31, 2012
 
10,445,135

 
14.75

 
3.7
 
$
31,861

 
 
 
 
 
 
 
 
 
Exercisable at end of period
 
7,115,744

 
$
13.81

 
3.2
 
$
30,031

Disclosure of intrinsic value of stock options exercised and grant-date fair value of awards vested [Table Text Block]
The following is a summary of the total intrinsic value of stock options and SARs exercised and grant-date fair value of stock options and SARs vested:
 
 
Year Ended December 31,
In thousands
 
2012
 
2011
 
2010
Intrinsic value of stock options exercised
 
$
17,315

 
$
20,463

 
$
12,670

Grant-date fair value of stock options and SARs vested
 
26,391

 
11,416

 
8,689

Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]
The following is a summary of cash received from stock option exercises under share-based payment arrangements and tax benefits realized from the exercises of stock options and SARs:
 
 
Year Ended December 31,
In thousands
 
2012
 
2011
 
2010
Cash received from stock option exercises
 
$
6,022

 
$
4,685

 
$
4,867

Tax benefit realized for the exercises of stock options and SARs
 
241

 
879

 
4,603

Omnibus Stock and Incentive Plan [Member]
 
Stock Compensation Plans [Line Items]  
Summary of Vesting Date Fair Value Of Awards
Restricted Stock – 2004 Plan

As of December 31, 2012, there was $29.0 million of unrecognized compensation expense related to nonvested restricted stock grants.  This unrecognized compensation cost is expected to be recognized over a weighted-average period of 2.61 years.  The following is a summary of the total vesting date fair value of restricted stock under the 2004 Plan:

 
 
Year Ended December 31,
In thousands
 
2012
 
2011
 
2010
Fair value of restricted stock vested
 
$
22,332

 
$
12,355

 
$
12,731

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of the status of our nonvested restricted stock grants issued under our 2004 Plan and the changes during the year ended December 31, 2012 is presented below:
 
 
Number
of Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested at December 31, 2011
 
3,131,435

 
$
14.82

Granted
 
1,909,739

 
16.94

Vested
 
(1,378,496
)
 
15.38

Forfeited
 
(256,471
)
 
17.08

Nonvested at December 31, 2012
 
3,406,207

 
15.60

Restricted Stock Encore [Member]
 
Stock Compensation Plans [Line Items]  
Summary of Vesting Date Fair Value Of Awards
The following is a summary of the total vesting date fair value of restricted stock under the Encore Plan:

 
 
Year Ended December 31,
In thousands
 
2012
 
2011
 
2010
Fair value of restricted stock vested
 
$
584

 
$
2,259

 
$
6,571

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of the status of the non-vested restricted stock grants under the Encore Plan and the changes during the year ended December 31, 2012 is presented below:
 
 
Number
of Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested at December 31, 2011
 
103,043

 
$
15.43

Vested
 
(36,049
)
 
15.43

Forfeited
 
(10,736
)
 
15.43

Nonvested at December 31, 2012
 
56,258

 
15.43

Performance Based TSR Awards [Member]
 
Stock Compensation Plans [Line Items]  
Summary of Share-Based Award Valuation Assumptions
Performance-Based Equity Awards

During 2012, we granted Performance-based Operational Awards and Performance-based TSR Awards to our officers. The range of assumptions used in the Monte Carlo simulation valuation approach for Performance-based TSR Awards, which were granted for the first time during 2012, are as follows:

 
 
2012
Weighted average fair value of Performance-based TSR Award granted
 
$
24.68

Risk-free interest rate
 
0.42
%
Expected life
 
2.81 years

Expected volatility
 
45.2
%
Dividend yield
 
%
Performance Equity Awards [Member]
 
Stock Compensation Plans [Line Items]  
Summary of Vesting Date Fair Value Of Awards
The following is a summary of the total vesting date fair value of performance-based equity awards:
 
 
Year Ended December 31,
In thousands
 
2012
 
2011
 
2010
Vesting date fair value of Performance-based Operational Awards
 
$
2,191

 
$
10,892

 
$
7,532

Schedule of Nonvested Performance-based Units Activity [Table Text Block]
A summary of the status of the nonvested performance-based equity awards (presented at the target level) during the year ended December 31, 2012 is as follows:
 
 
Performance-based Operational Awards
 
Performance-based TSR Awards
 
 
Number
of Awards
 
Weighted
Average
Grant-Date Fair Value
 
Number
of Awards
 
Weighted
Average
Grant-Date Fair Value
Nonvested at December 31, 2011
 
214,627

 
$
18.71

 

 
$

Granted
 
110,615

 
17.27

 
96,325

 
24.68

Vested(1)
 
(214,627
)
 
18.71

 

 

Forfeited
 
(10,422
)
 
17.27

 
(9,408
)
 
24.68

Nonvested at December 31, 2012
 
100,193

 
17.27

 
86,917

 
$
24.68


(1)
During 2012, the 2011 annual Performance-based Operational Awards vested, and award holders received shares equivalent to 56% of the number of target-level shares.