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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited)
 
Revenues
 
Gross Profit
 
Net Income (Loss)
 
Net Income
Per Share—
Basic(1)
 
Net Income
Per Share—
Diluted(1)
 
(In thousands, except per share amounts)
2019
 
 
 
 
 
 
 
 
 
1st Quarter
$
237,182

 
$
102,571

 
$
31,643

 
$
1.76

 
$
1.73

2nd Quarter
228,080

 
94,855

 
21,390

 
1.20

 
1.18

3rd Quarter
217,405

 
89,720

 
23,917

 
1.38

 
1.36

4th Quarter
227,511

 
95,668

 
27,396

 
1.61

 
1.59

2018
 
 
 
 
 
 
 
 
 
1st Quarter
$
188,163

 
$
83,500

 
$
17,073

 
$
0.93

 
$
0.92

2nd Quarter
184,471

 
78,590

 
12,713

 
0.70

 
0.69

3rd Quarter
194,099

 
92,626

 
23,587

 
1.31

 
1.29

4th Quarter
214,198

 
98,371

 
26,981

 
1.49

 
1.47

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(1) The quarterly amounts of earnings per share may not add to the full year amount as each quarterly calculation is discrete from the full-year calculation.