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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]
The following table sets forth the computation of basic and diluted earnings per share on net income (loss) (in thousands, except per share information):
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2014
 
2013
 
2014
 
2013
Earnings:
 
 
 
 
 
 
 
 
Net income (loss) (numerator for basic and diluted calculations)
 
$
198,296

 
$
(49,612
)
 
$
334,960

 
$
135,923

Shares:
 
 
 
 
 
 
 
 
Weighted average outstanding shares (denominator for basic calculation)
 
69,076

 
72,350

 
69,823

 
73,089

Equivalent shares from outstanding stock options
 
642

 
—

 
666

 
484

Denominator for diluted calculation
 
69,718

 
72,350

 
70,489

 
73,573

Earnings per share:
 
 
 
 
 
 
 
 
Basic
 
$
2.87

 
$
(0.69
)
 
$
4.80

 
$
1.86

Diluted
 
$
2.84

 
$
(0.69
)
 
$
4.75

 
$
1.85