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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic and diluted earnings (loss) per common share ("EPS") are calculated as follows:
  
Quarter ended June 30,
 
Six months ended June 30,
(In thousands, except per share amounts)
2013
 
2012
 
2013
 
2012
Net income (loss)
$
31,100

 
$
5,508

 
$
33,477

 
$
(5,634
)
 
 
 
 
 
 
 
 
Weighted average common shares outstanding (used to calculate basic EPS)
46,481

 
45,945

 
46,426

 
45,892

Dilutive effect of stock options and other stock awards
835

 
279

 
769

 
—

Weighted average common shares outstanding (used to calculate diluted EPS)
47,316

 
46,224

 
47,195

 
45,892

 
 
 
 
 
 
 
 
Earnings (loss) per common share – basic
$
0.67

 
$
0.12

 
$
0.72

 
$
(0.12
)
Earnings (loss) per common share – diluted
$
0.66

 
$
0.12

 
$
0.71

 
$
(0.12
)