Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Weighted average common shares outstanding

A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculations was as follows:

	Three Months Ended
	March 31,
	2018	2017
	(In thousands)
Weighted average common shares outstanding - basic	195,304	195,304
Effect of dilutive performance share awards	678	719
Weighted average common shares outstanding - diluted	195,982	196,023
Shares excluded from the calculation of diluted earnings per share	—	—