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Shareholders’ equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended 26 Months Ended
Aug. 31, 2011
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)   195,000,000 195,000,000 195,000,000
Stock repurchase program, Authorized Amount $ 60,000      
Number of shares Treasury stock acquired (in shares)     4,786,521  
Treasury stock acquired, Aggregate purchase price     49,924  
Stock repurchase program, Remaining authorized repurchase amount   $ 10,076    
Series A Convertible Preferred Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, Beginning balance   80,283    
Conversion of convertible preferred stock (in shares)   (549)    
Issuance for stock compensation plans (in shares)   0    
Shares, Ending balance   79,734 79,734  
Treasury Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, Beginning balance   4,786,521    
Conversion of convertible preferred stock (in shares)   0    
Issuance for stock compensation plans (in shares)   0    
Shares, Ending balance   4,786,521 4,786,521  
Common Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Shares, Beginning balance   88,548,637    
Conversion of convertible preferred stock (in shares)   54,825    
Issuance for stock compensation plans (in shares)   79,469    
Shares, Ending balance   88,682,931 88,682,931