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Earnings (Loss) Per Share Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings (Loss) Per Share [Table Text Block]
The following data shows the amounts used in computing earnings (loss) per share:
 
Income (Loss)
(Numerator)
 
Weighted
Shares
(Denominator)
 
Per-Share
Amount
 
(In thousands except per share amounts)
For the year ended December 31, 2015:
 
 
 
 
 
Basic loss per common share
$
(1,037,361
)
 
49,110

 
$
(21.12
)
Effect of dilutive stock options, restricted stock, and SARs
—

 
—

 
—

Diluted loss per common share
$
(1,037,361
)
 
49,110

 
$
(21.12
)
For the year ended December 31, 2016:
 
 
 
 
 
Basic loss per common share
$
(135,624
)
 
50,029

 
$
(2.71
)
Effect of dilutive stock options, restricted stock, and SARs
—

 
—

 
—

Diluted loss per common share
$
(135,624
)
 
50,029

 
$
(2.71
)
For the year ended December 31, 2017:
 
 
 
 
 
Basic earnings per common share
$
117,848

 
51,113

 
$
2.31

Effect of dilutive restricted stock
—

 
635

 
(0.03
)
Diluted earnings per common share
$
117,848

 
51,748

 
$
2.28
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
The following options and their average exercise prices were not included in the computation of diluted earnings per share because the option exercise prices were greater than the average market price of our common stock for the years ended December 31:
 
2017
 
2016
 
2015
Options and SARs
87,500

 
199,755

 
261,270

Average exercise price
$
51.34

 
$
48.79

 
$
50.34