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Earnings per common share (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Weighted average common shares outstanding - basic 189,820 188,831
Effect of dilutive performance share awards 612 391
Weighted average common shares outstanding - diluted 190,432 189,222
Shares excluded from the calculation of diluted earnings per share 0 0