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Selected Quarterly Financial Data (unaudited) (Tables)
12 Months Ended
Dec. 31, 2020
Selected Quarterly Financial Data (unaudited) [Abstract]  
Quarterly Financial Information

Quarter

(in thousands, except per share amounts)

First

Second

Third

Fourth

2020

Revenue

$

178,461

$

219,999

$

271,470

$

264,912

Gross profit

135,240

159,300

204,036

199,239

Income from operations before income taxes

23,624

28,158

44,633

37,850

Net income

18,477

21,935

34,453

27,994

Basic earnings per share

1.57

1.86

2.93

2.38

Diluted earnings per share

1.56

1.86

2.91

2.36

2019

Revenue

$

165,876

$

187,103

$

190,061

$

170,632

Gross profit

125,147

140,710

142,933

128,068

Income from operations before income taxes

25,021

27,778

20,583

18,981

Net income

20,750

21,383

15,902

19,881

Basic earnings per share

1.75

1.80

1.36

1.71

Diluted earnings per share

1.70

1.75

1.32

1.66