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Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2018

Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share



	Three Months Ended			Six Months Ended
	June 30,			June 30,
(Weighted-average shares)	2018	2017		2018	2017
Basic method	173,042,626	172,557,978		172,907,537	172,482,223
Dilutive stock options and restricted stock units	939,994	–	1	2,019,525	534,441
Diluted method	173,982,620	172,557,978		174,927,062	173,016,664

1Due to a net loss in the three-month period ended June 30, 2017, no unvested stock awards were included in the computation of diluted earnings per shares because the effect would have been anti-dilutive.

Anti Dilutive Securities Not Included in Computation of Diluted EPS



	Three Months Ended				Six Months Ended
		June 30,			June 30,
		2018	2017		2018		2017
Antidilutive stock options excluded from diluted shares		3,396,951		5,578,634		3,622,106		4,903,084
Weighted average price of these options	$	50.22	$	46.64	$	50.56	$	52.01