Earnings Per Common Share

Nonvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are participating securities and are included in the computation of earnings per share pursuant to the two-class method. The two-class method is an earnings allocation formula that determines earnings per share for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. Certain of the Company's nonvested restricted stock awards qualify as participating securities.

Net earnings is allocated between the common stock and participating securities pursuant to the two-class method. Basic earnings per common share is computed by dividing net earnings available to common shareholders by the weighted average number of common shares outstanding during the period, excluding participating nonvested restricted shares.

Diluted earnings per common share is computed in a similar manner, except that first the denominator is increased to include the number of additional common shares that would have been outstanding if potentially dilutive common shares, excluding the participating securities, were issued using the treasury stock method. For all periods presented, stock options, restricted stock awards and restricted stock units are the only potentially dilutive non-participating instruments issued by the Company. Next, we determine and include in diluted earnings per common share calculation the more dilutive effect of the participating securities using the treasury stock method or the two-class method. Undistributed losses are not allocated to the nonvested share-based payment awards (the participating securities) under the two-class method as the holders are not contractually obligated to share in the losses of the Company.

The following is a computation of basic and diluted earnings per common share for the three and six months ended June 30, 2017 and 2016:



(in thousands, except per share data)	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
NUMERATORS:
Net income	$	56,812	$	54,287	$	102,815	$	101,856
Less:
Dividends and undistributed earnings allocated to participating securities (1)	14		32		26		61
Net earnings available to common shareholders	$	56,798	$	54,255	$	102,789	$	101,795
DENOMINATORS:
Weighted average number of common shares outstanding - basic	220,310		220,421		220,298		220,324
Effect of potentially dilutive common shares (2)	443		486		492		677
Weighted average number of common shares outstanding - diluted	220,753		220,907		220,790		221,001
EARNINGS PER COMMON SHARE:
Basic	$	0.26	$	0.25	$	0.47	$	0.46
Diluted	$	0.26	$	0.25	$	0.47	$	0.46


(1)	Represents dividends paid and undistributed earnings allocated to certain nonvested restricted stock awards.


(2)	Represents the effect of the assumed exercise of stock options, vesting of non-participating restricted shares, and vesting of restricted stock units, based on the treasury stock method.

The following table presents the weighted average outstanding securities that were not included in the computation of diluted earnings per common share because their effect would be anti-dilutive for the three and six months ended June 30, 2017 and 2016.



(in thousands)	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2017	2016	2017	2016
Stock options	—	50	18	107
Restricted stock	—	1	—	—