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Selected Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]  
Schedule Of Quarterly Financial Information [Table Text Block]
Summarized unaudited quarterly financial information is as follows:
 
Three Months Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(In thousands except per share amounts)
 
2016
 
 
 
 
 
 
 
 
Revenues
$
136,184

 
$
138,305

 
$
153,408

 
$
174,280

 
Gross income (loss) (1)
$
(49,745
)
 
$
(73,830
)
 
$
(26,893
)
 
$
36,782

 
Net income (loss)
$
(41,149
)
 
$
(72,136
)
 
$
(24,022
)
 
$
1,683

 
Net income (loss) per common share:
 
 
 
 
 
 
 
 
Basic (2)
$
(0.83
)
 
$
(1.44
)
 
$
(0.48
)
 
$
0.03

 
Diluted (2)
$
(0.83
)
 
$
(1.44
)
 
$
(0.48
)
 
$
0.03

 
2017
 
 
 
 
 
 
 
 
Revenues
$
175,724

 
$
170,581

 
$
188,488

 
$
204,847

 
Gross income (1)
$
32,657

 
$
24,462

 
$
27,181

 
$
37,211

 
Net income
$
15,929

 
$
9,059

 
$
3,705

 
$
89,155

 
Net income per common share:
 
 
 
 
 
 
 
 
Basic
$
0.32

 
$
0.18

 
$
0.07

 
$
1.74

 
Diluted (2)
$
0.31

 
$
0.17

 
$
0.07

 
$
1.71

 
_________________________
(1)
Gross income (loss) excludes general and administrative expense, interest expense, (gain) loss on disposition of assets, gain (loss) on derivatives, income taxes, and other income (loss).
(2)
The earnings (loss) per share for the year's four quarters does not equal annual income (loss) per share.