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Shareholders’ equity (Tables)
6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders Equity
Common and Preferred Stock Activity:
Preferred stock
Common stock
 
Series A convertible
Treasury
Outstanding
Beginning balance as of December 31, 2012
80,283

4,786,521

88,548,637

Repurchase of common stock



Conversion of convertible preferred stock
(199
)

19,864

Issuance for stock compensation plans


34,208

Ending balance as of June 30, 2013
80,084

4,786,521

88,602,709