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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
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:
201820172015
 (In millions)
Recognized stock compensation expense$17.8 $13.3 $9.6 
Capitalized stock compensation cost for our oil and natural gas properties2.1 1.8 2.1 
Tax benefit on stock based compensation4.4 5.0 3.6 
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, 2016131,770 $46.60 
Granted— — 
Exercised— — 
Forfeited(40,515)51.76 
Outstanding at December 31, 201691,255 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:
EmployeesNumber of Time Vested SharesNumber of Performance Vested Shares
Total Number of
Shares
Weighted
Average
Price
Nonvested at January 1, 2016936,662 277,160 1,213,822 $41.29 
Granted494,078 152,373 646,451 5.62 
Vested(425,195)— (425,195)43.47 
Forfeited(75,808)(57,405)(133,213)36.87 
Nonvested at December 31, 2016929,737 372,128 1,301,865 23.32 
Granted485,799 173,373 659,172 26.07 
Vested(455,570)(62,119)(517,689)29.87 
Forfeited(44,408)(34,953)(79,361)38.87 
Nonvested at December 31, 2017915,558 448,429 1,363,987 21.25 
Granted844,498 390,445 1,234,943 20.52 
Vested(470,171)(209,643)(679,814)24.30 
Forfeited(21,002)(21,106)(42,108)19.80 
Nonvested at December 31, 20181,268,883 608,125 1,877,008 $19.70 

Non-Employee Directors
Number of
Shares
Weighted
Average
Price
Nonvested at January 1, 201642,064 $41.83 
Granted90,000 12.02 
Vested(20,248)43.46 
Forfeited— — 
Nonvested at December 31, 2016111,816 $17.21 
Granted49,104 17.92 
Vested(43,206)21.24 
Forfeited— — 
Nonvested at December 31, 2017117,714 $16.03 
Granted44,312 19.86 
Vested(54,981)17.08 
Forfeited— — 
Nonvested at December 31, 2018107,045 $17.07 
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, 2016129,500 $54.15 
Granted— — 
Exercised— — 
Forfeited(21,000)62.40 
Outstanding at December 31, 2016108,500 52.56 
Granted— — 
Exercised— — 
Forfeited(21,000)57.63 
Outstanding at December 31, 201787,500 51.34 
Granted— — 
Exercised— — 
Forfeited(21,000)73.26 
Outstanding at December 31, 201866,500 $44.42 
Shares Authorized Under Nonemployee Director Option Plans By Exercise Price Range [Table Text Block]
 Outstanding and Exercisable
Options at December 31, 2018 
Weighted Average Exercise Price
Number 
of Shares
Weighted Average Remaining
Contractual Life
Weighted Average
Exercise Price
$31.30 - $41.21 38,500 0.9 years$37.58 
$53.81 - $73.26 28,000 2.3 years$53.81