Three Months Ended

Six Months Ended

June 30,

2019

2018

2019

2018

(Dollars in thousands, except per share amounts)

Numerator

Net income

$

54,593

$

63,899

$

95,143

$

102,663

Less: distributed earnings allocated to participating securities

(110

)

(96

)

(221

)

(201

)

Less: undistributed earnings allocated to participating securities

(213

)

(204

)

(352

)

(344

)

Net income attributable to common stockholders (numerator for basic earnings per share)

54,270

63,599

94,570

102,118

Add back: undistributed earnings allocated to participating securities

213

204

352

344

Less: undistributed earnings reallocated to participating securities

(209

)

(201

)

(345

)

(338

)

Numerator for diluted earnings per share under two class method

$

54,274

$

63,602

$

94,577

$

102,124

Denominator

Weighted-average common shares outstanding

61,336,404

60,590,899

61,138,982

60,466,527

Add: dilutive effect of stock options

1,435,739

1,013,387

1,333,043

1,058,915

Add: dilutive effect of performance stock units

551,124

Denominator for diluted earnings per share under two class method

63,323,267

61,604,286

63,023,149

61,525,442

Basic Earnings Per Common Share

$

0.88

$

1.05

$

1.55

$

1.69

Diluted Earnings Per Common Share

$

0.86

$

1.03

$

1.50

$

1.66