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Net income (loss) per common share (Tables)
 6 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):
 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
Net income (loss)
$
99,806

 
$
(21,184
)
 
$
178,385

 
$
57,526

Weighted average common shares outstanding
197,825

 
194,060

 
197,388

 
193,756

Dilutive effect of stock options and RSUs
4,144

 
—

 
3,908

 
3,701

Dilutive effect of convertible debt
14,506

 
—

 
13,075

 
7,170

Weighted average common and potential common shares outstanding
216,475

 
194,060

 
214,371

 
204,627

Basic net income (loss) per common share
$
0.50

 
$
(0.11
)
 
$
0.90

 
$
0.30

Diluted net income (loss) per common share
$
0.46

 
$
(0.11
)
 
$
0.83

 
$
0.28