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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
2016
 
2015 (1)
 
2014
 
(In millions)
Recognized stock compensation expense
$
9.6

 
$
15.3

 
$
17.4

Capitalized stock compensation cost for our oil and natural gas properties
2.1

 
3.5

 
3.7

Tax benefit on stock based compensation
3.6

 
5.8

 
6.7

_________________________
(1)
In 2015, recognized stock compensation was reduced by $3.2 million, capitalized stock compensation cost for our oil and natural gas properties was reduced by $0.2 million, and the tax benefit was reduced by $1.2 million for lower expected payouts related to the performance shares.
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, 2014
145,901

 
$
46.59

Granted
—

 
—

Exercised
(14,131
)
 
46.50

Forfeited
—

 
—

Outstanding at December 31, 2014
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
Shares Authorized Under Stock Appreciation Rights By Exercise Price [Table Text Block]

 
Outstanding and Exercisable SARs at
December 31, 2016
Exercise Prices
Number 
of Shares
 
Weighted Average Remaining
Contractual Life
 
Weighted Average
Exercise Price
$44.31
91,255
 
1.0 year
 
$44.31
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, 2014
652,835

 
123,908

 
776,743

 
$
48.70

Granted
383,448

 
71,674

 
455,122

 
53.72

Vested
(291,712
)
 
(13,092
)
 
(304,804
)
 
49.68

Forfeited
(19,805
)
 
(6,970
)
 
(26,775
)
 
51.92

Nonvested at December 31, 2014
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


Non-Employee Directors
Number of
Shares
 
Weighted
Average
Price
Nonvested at January 1, 2014
35,704

 
$
41.07

Granted
13,768

 
63.91

Vested
(14,336
)
 
40.93

Forfeited
—

 
—

Nonvested at December 31, 2014
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
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, 2014
68,920

 
$
37.81

Granted
—

 
—

Exercised
(21,490
)
 
37.83

Forfeited
(37,930
)
 
37.83

Outstanding at December 31, 2014
9,500

 
37.69

Granted
—

 
—

Exercised
—

 
—

Forfeited
(9,500
)
 
37.69

Outstanding at December 31, 2015
—

 
—

Granted
—

 
—

Exercised
—

 
—

Forfeited
—

 
—

Outstanding at December 31, 2016
—

 
$
—
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, 2014
171,500

 
$
51.70

Granted
—

 
—

Exercised
(21,000
)
 
33.94

Forfeited
—

 
—

Outstanding at December 31, 2014
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
Shares Authorized Under Nonemployee Director Option Plans By Exercise Price Range [Table Text Block]
 
Outstanding and Exercisable
Options at December 31, 2016
Weighted Average Exercise Price
Number 
of Shares
 
Weighted Average Remaining
Contractual Life
 
Weighted Average
Exercise Price
$31.30 - $41.21
38,500

 
2.9 years
 
$
37.58

$53.81 - $73.26
70,000

 
2.2 years
 
$
60.79