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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
 
 
Quarter
 
 
 
 
First
 
Second
 
Third
 
Fourth
 
Full Year
 
 
(In thousands, except per share data)
Years Ended December 31,
 
 
 
 
 
 
 
 
 
 
2018
 
 
 
 
 
 
 
 
 
 
Total revenues
 
$
2,860,026

 
$
2,943,462

 
$
2,889,058

 
$
2,908,812

 
$
11,601,358

Gross profit
 
419,763

 
438,163

 
435,101

 
432,066

 
1,725,093

Net income (loss)
 
35,814

 
56,463

 
34,777

 
30,718

 
157,772

Basic earnings (loss) per share (1)
 
1.70

 
2.72

 
1.74

 
1.62

 
7.83

Diluted earnings (loss) per share (1)
 
1.70

 
2.72

 
1.74

 
1.62

 
7.83

2017
 
 
 
 
 
 
 
 
 
 
Total revenues
 
$
2,518,829

 
$
2,672,195

 
$
3,012,292

 
$
2,920,405

 
$
11,123,721

Gross profit
 
383,522

 
404,892

 
431,420

 
425,675

 
1,645,509

Net income (loss)
 
33,939

 
39,133

 
29,881

 
110,489

 
213,442

Basic earnings (loss) per share (1)
 
1.58

 
1.84

 
1.43

 
5.27

 
10.08

Diluted earnings (loss) per share (1)
 
1.58

 
1.84

 
1.43

 
5.27

 
10.08

(1) The sum of the quarterly income per share amounts may not equal the annual amount reported, as per share amounts are computed independently for each quarter and for the full year based on the respective weighted average common shares outstanding.