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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Earnings Per Common Share
Summarized basic and diluted earnings per common share were calculated as follows: 
 
Year Ended December 31,
 (In thousands, except per share data)
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net earnings (loss)
$
(105,195
)
 
$
(953,520
)
 
$
96,422

Denominator:
 
 
 
 
 
Weighted-average shares outstanding
53,121

 
53,050

 
52,850

Effect of dilutive stock awards
—

 
—

 
276

Weighted-average dilutive shares
53,121

 
53,050

 
53,126

 
 
 
 
 
 
Basic (loss) earnings per share
$
(1.98
)
 
$
(17.97
)
 
$
1.82

Diluted (loss) earnings per share
$
(1.98
)
 
$
(17.97
)
 
$
1.81