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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 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,
 
 
2013
 
2012
 
2013
 
2012
Earnings:
 
 
 
 
 
 
 
 
Net income (loss) (numerator for basic and diluted calculations)
 
$
(49,612
)
 
$
141,111

 
$
135,923

 
$
264,429

Shares:
 
 
 
 
 
 
 
 
Weighted average outstanding shares (denominator for basic calculation)
 
72,350

 
73,718

 
73,089

 
73,646

Equivalent shares from outstanding stock options
 
—

 
336

 
484

 
402

Denominator for diluted calculation
 
72,350

 
74,054

 
73,573

 
74,048

Earnings per share:
 
 
 
 
 
 
 
 
Basic
 
$
(0.69
)
 
$
1.91

 
$
1.86

 
$
3.59

Diluted
 
$
(0.69
)
 
$
1.91

 
$
1.85

 
$
3.57