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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Restricted Stock Awards [Table Text Block]
For restricted stock awards, we had:
201920182017
 (In millions)
Recognized stock compensation expense$12.8  $17.8  $13.3  
Capitalized stock compensation cost for our oil and natural gas properties2.4  2.1  1.8  
Tax benefit on stock based compensation3.1  4.4  5.0  
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, 2017929,737  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  
Granted927,173  500,256  1,427,429  16.09  
Vested(570,107) (233,835) (803,942) 15.56  
Forfeited(98,301) (33,172) (131,473) 19.36  
Nonvested at December 31, 20191,527,648  841,374  2,369,022  $18.95  
Non-Employee Directors
Number of
Shares
Weighted
Average
Price
Nonvested at January 1, 2017111,816  $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  
Granted72,784  12.09  
Vested(61,141) 15.49  
Forfeited—  —  
Nonvested at December 31, 2019118,688  $14.83  
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, 2017108,500  $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  
Granted—  —  
Exercised—  —  
Forfeited(24,500) 37.31  
Outstanding at December 31, 201942,000  $48.56  
Shares Authorized Under Nonemployee Director Option Plans By Exercise Price Range [Table Text Block]
 Outstanding and Exercisable
Options at December 31, 2019
Weighted Average Exercise Price
Number 
of Shares
Weighted Average Remaining
Contractual Life		Weighted Average
Exercise Price
$41.2117,500  0.3 years$41.21  
$53.8124,500  1.3 years$53.81