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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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, we had:
 
2017
 
2016
 
2015
 
(In millions)
Recognized stock compensation expense
$
13.3

 
$
9.6

 
$
15.3

Capitalized stock compensation cost for our oil and natural gas properties
1.8

 
2.1

 
3.5

Tax benefit on stock based compensation
5.0

 
3.6

 
5.8
Activity Pertaining to Stock Appreciation Rights [Table Text Block]

Activity pertaining to SARs granted under the amended plan is as follows:
 
Number of
Shares
 
Weighted
Average
Price
Outstanding at January 1, 2015
131,770

 
$
46.60

Granted
—

 
—

Exercised
—

 
—

Forfeited
—

 
—

Outstanding at December 31, 2015
131,770

 
46.60

Granted
—

 
—

Exercised
—

 
—

Forfeited
(40,515
)
 
51.76

Outstanding at December 31, 2016
91,255

 
44.31

Granted
—

 
—

Exercised
—

 
—

Forfeited
(91,255
)
 
44.31

Outstanding at December 31, 2017
—

 
$
—
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 Time Vested Shares
 
Number of Performance Vested Shares
 
Total Number of
Shares
 
Weighted
Average
Price
Nonvested at January 1, 2015
724,766

 
175,520

 
900,286

 
$
50.81

Granted
576,361

 
148,081

 
724,442

 
34.06

Vested
(343,657
)
 
(39,245
)
 
(382,902
)
 
49.69

Forfeited
(20,808
)
 
(7,196
)
 
(28,004
)
 
45.33

Nonvested at December 31, 2015
936,662

 
277,160

 
1,213,822

 
41.29

Granted
494,078

 
152,373

 
646,451

 
5.62

Vested
(425,195
)
 
—

 
(425,195
)
 
43.47

Forfeited
(75,808
)
 
(57,405
)
 
(133,213
)
 
36.87

Nonvested at December 31, 2016
929,737

 
372,128

 
1,301,865

 
23.32

Granted
485,799

 
173,373

 
659,172

 
26.07

Vested
(455,570
)
 
(62,119
)
 
(517,689
)
 
29.87

Forfeited
(44,408
)
 
(34,953
)
 
(79,361
)
 
38.87

Nonvested at December 31, 2017
915,558

 
448,429

 
1,363,987

 
$
21.25


Non-Employee Directors
Number of
Shares
 
Weighted
Average
Price
Nonvested at January 1, 2015
35,136

 
$
50.08

Granted
25,848

 
34.04

Vested
(18,920
)
 
46.51

Forfeited
—

 
—

Nonvested at December 31, 2015
42,064

 
$
41.83

Granted
90,000

 
12.02

Vested
(20,248
)
 
43.46

Forfeited
—

 
—

Nonvested at December 31, 2016
111,816

 
$
17.21

Granted
49,104

 
17.92

Vested
(43,206
)
 
21.24

Forfeited
—

 
—

Nonvested at December 31, 2017
117,714

 
$
16.03
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, 2015
9,500

 
$
37.69

Granted
—

 
—

Exercised
—

 
—

Forfeited
(9,500
)
 
37.69

Outstanding at December 31, 2015
—

 
—

Granted
—

 
—

Exercised
—

 
—

Forfeited
—

 
—

Outstanding at December 31, 2016
—

 
—

Granted
—

 
—

Exercised
—

 
—

Forfeited
—

 
—

Outstanding at December 31, 2017
—

 
$
—
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, 2015
150,500

 
$
54.18

Granted
—

 
—

Exercised
—

 
—

Forfeited
(21,000
)
 
54.35

Outstanding at December 31, 2015
129,500

 
54.15

Granted
—

 
—

Exercised
—

 
—

Forfeited
(21,000
)
 
62.40

Outstanding at December 31, 2016
108,500

 
52.56

Granted
—

 
—

Exercised
—

 
—

Forfeited
(21,000
)
 
57.63

Outstanding at December 31, 2017
87,500

 
$
51.34
Shares Authorized Under Nonemployee Director Option Plans By Exercise Price Range [Table Text Block]
 
Outstanding and Exercisable
Options at December 31, 2017
Weighted Average Exercise Price
Number 
of Shares
 
Weighted Average Remaining
Contractual Life
 
Weighted Average
Exercise Price
$31.30 - $41.21
38,500

 
1.9 years
 
$
37.58

$53.81 - $73.26
49,000

 
2.1 years
 
$
62.15