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Shareholders' equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 29 Months Ended
Aug. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Jul. 31, 2008
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of common stock (in shares)         4,786,521  
Common stock, shares authorized (in shares)   195,000,000 195,000,000   195,000,000  
Stock repurchase program, authorized amount $ 60,000          
Treasury stock acquired, Aggregate purchase price     4,033 45,891 49,924  
Stock repurchase program, Remaining authorized repurchase amount   $ 10,076        
Preferred Stock, Shares Authorized (in shares)   5,000,000 5,000,000   5,000,000  
2008 Series A Convertible Preferred Stocks, Issued (in shares)           160,000
Preferred Stock, Par or Stated Value Per Share   $ 0.01 $ 0.01   $ 0.01  
Preferred Stock, Liquidation Preference Per Share   $ 0.01     $ 0.01  
Conversion of convertible preferred stock (in shares)   100     100  
Series A Convertible Preferred Stock [Member]
            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shares, Beginning balance   80,283 80,718 82,515    
Repurchase of common stock (in shares)     0 0    
Conversion of convertible preferred stock (in shares)   (663) (435) (1,797)    
Issuance for share-based compensation plans (in shares)   0 0 0    
Shares, Ending balance   79,620 80,283 80,718 79,620  
Treasury stock, at cost [Member]
            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shares, Beginning balance   4,786,521 4,386,521 0    
Repurchase of common stock (in shares)     400,000 4,386,521    
Conversion of convertible preferred stock (in shares)   0 0 0    
Issuance for share-based compensation plans (in shares)   0 0 0    
Shares, Ending balance   4,786,521 4,786,521 4,386,521 4,786,521  
Common stock [Member]
            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shares, Beginning balance   88,548,637 88,844,327 92,771,864    
Repurchase of common stock (in shares)     (400,000) (4,386,521)    
Conversion of convertible preferred stock (in shares)   66,244 43,556 179,692    
Issuance for share-based compensation plans (in shares)   95,396 60,754 279,292    
Shares, Ending balance   88,710,277 88,548,637 88,844,327 88,710,277