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Shareholders’ equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 35 Months Ended 6 Months Ended
Aug. 31, 2011
Jun. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Series A Convertible Preferred Stock [Member]
Jun. 30, 2013
Series A Convertible Preferred Stock [Member]
Jun. 30, 2014
Treasury Stock [Member]
Jun. 30, 2013
Treasury Stock [Member]
Jun. 30, 2014
Common Stock [Member]
Jun. 30, 2013
Common Stock [Member]
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                  
Repurchase of common stock (in shares)     4,786,521              
Repurchase of common stock, aggregate purchase price     49,924              
Stock repurchase program, remaining authorized repurchase amount   $ 10,076                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Shares, Beginning balance         79,620 80,283 4,786,521 4,786,521 88,710,277 88,548,637
Conversion of convertible preferred stock (in shares)         (394) (199) 0 0 39,455 19,864
Issuance for stock compensation plans (in shares)         0 0 0 0 55,029 34,208
Shares, Ending balance         79,226 80,084 4,786,521 4,786,521 88,804,761 88,602,709