Earnings per common share (Tables)

6 Months Ended

Jun. 30, 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		Six Months Ended
	June 30,		June 30,
	2018	2017	2018	2017
	(In thousands)
Weighted average common shares outstanding - basic	195,524	195,304	195,415	195,304
Effect of dilutive performance share awards and restricted stock units	645	669	662	689
Weighted average common shares outstanding - diluted	196,169	195,973	196,077	195,993
Shares excluded from the calculation of diluted earnings per share	—	—	—	—