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Earnings per common share (Details)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Weighted average common shares outstanding - basic 188,831 188,831 188,831 188,824
Effect of dilutive stock options and performance share awards 807 0 803 205
Weighted average common shares outstanding - diluted 189,638 188,831 189,634 189,029
Shares excluded from the calculation of diluted earnings per share 0 434 0 0