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Shareholders’ equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 23 Months Ended
Aug. 31, 2011
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
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)     400,000 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      
Repurchase of common stock (in shares)   0      
Conversion of convertible preferred stock (in shares)   (199)      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   0      
Shares, Ending balance   80,084   80,084  
Treasury Stock [Member]
          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares, Beginning balance   4,786,521      
Repurchase of common stock (in shares)   0      
Conversion of convertible preferred stock (in shares)   0      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   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      
Repurchase of common stock (in shares)   0      
Conversion of convertible preferred stock (in shares)   19,864      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   34,208      
Shares, Ending balance   88,602,709   88,602,709