Years Ended December 31,

2017

2016

2015

(in thousands, except per share amounts)

Net income available to common stockholders

$

43,220

$

31,060

$

41,199

Earnings allocated to participating securities

(141)

(147)

(157)

Income attributable to common stock

$

43,079

$

30,913

$

41,042

Weighted average common shares outstanding, including participating securities

31,943

30,453

29,989

Weighted average participating securities

(41)

(54)

(51)

Weighted average common shares outstanding

31,902

30,399

29,938

Incremental shares from assumed conversions of options, performance units and restricted shares

335

291

346

Weighted average common and equivalent shares outstanding

32,237

30,690

30,284

Earnings per common share:

Basic

$

1.35

$

1.02

$

1.37

Diluted

1.34

1.01

1.36