Three months ended June 30,

Six months ended June 30,

2021

2020

2021

2020

Net earnings (loss) attributable to Kirby

$

10,190

$

25,002

$

6,815

$

(322,239

)

Undistributed earnings allocated to restricted shares

(8

)

(46

)

(6

)

—

Earnings (loss) available to Kirby common stockholders – basic

10,182

24,956

6,809

(322,239

)

Undistributed earnings allocated to restricted shares

8

46

6

—

Undistributed earnings reallocated to restricted shares

(8

)

(46

)

(6

)

—

Earnings (loss) available to Kirby common stockholders – diluted

$

10,182

$

24,956

$

6,809

$

(322,239

)

Shares outstanding:

Weighted average common stock issued and outstanding

60,101

60,023

60,088

60,003

Weighted average unvested restricted stock

(48

)

(111

)

(53

)

(105

)

Weighted average common stock outstanding – basic

60,053

59,912

60,035

59,898

Dilutive effect of stock options and restricted stock units

221

25

185

—

Weighted average common stock outstanding – diluted

60,274

59,937

60,220

59,898

Net earnings (loss) per share attributable to Kirby common stockholders:

Basic

$

0.17

$

0.42

$

0.11

$

(5.38

)

Diluted

$

0.17

$

0.42

$

0.11

$

(5.38

)