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Net income per common share (Tables)
 3 Months Ended
Jun. 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 per common share (in thousands, except per share amounts):
 
Three Months Ended
 
June 30,
 
2013
 
2012
Net income
$
78,579

 
$
78,710

Weighted average common shares outstanding
196,950

 
193,452

Dilutive effect of stock options and RSUs
3,672

 
3,546

Dilutive effect of convertible debt
11,644

 
6,702

Weighted average common and potential common shares outstanding
212,266

 
203,700

Basic net income per common share
$
0.40

 
$
0.41

Diluted net income per common share
$
0.37

 
$
0.39