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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Restricted Stock Awards Stock Options And SAR [Table Text Block]
For restricted stock awards and stock options, we had:
 
2014
 
2013
 
2012
 
(In millions)
Recognized stock compensation expense
$
17.4

 
$
16.1

 
$
11.4

Capitalized stock compensation cost for our oil and natural gas properties
3.7

 
3.5

 
2.7

Tax benefit on stock based compensation
6.7

 
6.2

 
4.5
Activity Pertaining to Stock Appreciation Rights [Table Text Block]
Activity pertaining to SARs granted under the Unit Corporation Stock and Incentive Compensation Plan is as follows:
 
Number of
Shares
 
Weighted
Average
Price
Outstanding at January 1, 2012
145,901

 
$
46.59

Granted
—

 
—

Exercised
—

 
—

Forfeited
—

 
—

Outstanding at December 31, 2012
145,901

 
46.59

Granted
—

 
—

Exercised
—

 
—

Forfeited
—

 
—

Outstanding at December 31, 2013
145,901

 
46.59

Granted
—

 
—

Exercised
(14,131
)
 
46.50

Forfeited
—

 
—

Outstanding at December 31, 2014
131,770

 
$
46.60
Shares Authorized Under Stock Appreciation Rights By Exercise Price [Table Text Block]
 
Outstanding and exercisable SARs at
December 31, 2014
Exercise Prices
Number 
of Shares
 
Weighted Average Remaining
Contractual Life
 
Weighted Average
Exercise Price
$44.31
91,255
 
3.0 years
 
$44.31
$51.76
40,515
 
1.9 years
 
$51.76
Activity Pertaining To Restricted Stock Awards [Table Text Block]
Activity pertaining to restricted stock awards granted under the amended plan is as follows:
Employees
Number of
Shares
 
Weighted
Average
Price
Nonvested at January 1, 2012
447,961

 
$
47.44

Granted
376,445

 
47.37

Vested
(220,788
)
 
45.66

Forfeited
(14,091
)
 
45.37

Nonvested at December 31, 2012
589,527

 
48.11

Granted
453,549

 
48.20

Vested
(248,003
)
 
46.46

Forfeited
(18,330
)
 
47.85

Nonvested at December 31, 2013
776,743

 
48.70

Granted
455,122

 
53.72

Vested
(304,804
)
 
49.68

Forfeited
(26,775
)
 
51.92

Nonvested at December 31, 2014
900,286

 
$
50.81


Non-Employee Directors
Number of
Shares
 
Weighted
Average
Price
Nonvested at January 1, 2012
—

 
$
—

Granted
24,606

 
40.23

Vested
—

 
—

Forfeited
—

 
—

Nonvested at December 31, 2012
24,606

 
$
40.23

Granted
21,128

 
41.65

Vested
(10,030
)
 
40.23

Forfeited
—

 
—

Nonvested at December 31, 2013
35,704

 
$
41.07

Granted
13,768

 
63.91

Vested
(14,336
)
 
40.93

Forfeited
—

 
—

Nonvested at December 31, 2014
35,136

 
$
50.08
Activity Pertaining to the Stock Option Plan [Table Text Block]
Activity pertaining to the Stock Option Plan is as follows:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
Outstanding at January 1, 2012
138,980

 
$
31.39

Granted
—

 
—

Exercised
(18,850
)
 
20.38

Forfeited
(2,100
)
 
37.83

Outstanding at December 31, 2012
118,030

 
33.03

Granted
—

 
—

Exercised
(48,110
)
 
26.09

Forfeited
(1,000
)
 
37.83

Outstanding at December 31, 2013
68,920

 
37.81

Granted
—

 
—

Exercised
(21,490
)
 
37.83

Forfeited
(37,930
)
 
37.83

Outstanding at December 31, 2014
9,500

 
$
37.69
Shares Authorized Under Stock Option Plans By Exercise Price Range [Table Text Block]
 
Outstanding and Exercisable Options at December 31, 2014
Exercise Price
Number 
of Shares
 
Weighted Average Remaining
Contractual Life
 
Weighted Average
Exercise Price
$37.69
9,500
 
0.4 years
 
$37.69
Activity Pertaining to Nonemployee Director Stock Award Plan [Table Text Block]
Activity pertaining to the Directors’ Plan is as follows:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
Outstanding at January 1, 2012
199,500

 
$
48.37

Granted
—

 
—

Exercised
(7,000
)
 
20.28

Forfeited
—

 
—

Outstanding at December 31, 2012
192,500

 
49.39

Granted
—

 
—

Exercised
(17,500
)
 
32.53

Forfeited
(3,500
)
 
20.46

Outstanding at December 31, 2013
171,500

 
51.70

Granted
—

 
—

Exercised
(21,000
)
 
33.94

Forfeited
—

 
—

Outstanding at December 31, 2014
150,500

 
$
54.18
Shares Authorized Under Nonemployee Director Option Plans By Exercise Price Range [Table Text Block]
 
Outstanding and Exercisable
Options at December 31, 2014
Weighted Average Exercise Price
Number 
of Shares
 
Weighted Average Remaining
Contractual Life
 
Weighted Average
Exercise Price
$31.30 - $41.21
45,500

 
4.2 years
 
$
37.88

$53.81 - $73.26
105,000

 
3.5 years
 
$
61.24