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Earnings (loss) per common share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Weighted average common shares outstanding - basic 195,304 195,151 195,298 194,814
Effect of dilutive performance share awards 507 18 496 19
Weighted average common shares outstanding - diluted 195,811 195,169 195,794 194,833
Shares excluded from the calculation of diluted earnings per share 0 0 0 0