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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Table Text Block]
 
 
Quarter
 
 
 
 
First
 
Second
 
Third
 
Fourth
 
Full Year
 
 
(In thousands, except per share data)
Year Ended December 31,
 
 
 
 
 
 
 
 
 
 
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
 
33,939

 
39,133

 
29,881

 
110,489

 
213,442

Basic earnings per share (1)
 
1.58

 
1.84

 
1.43

 
5.27

 
10.08

Diluted earnings per share (1)
 
1.58

 
1.84

 
1.43

 
5.27

 
10.08

2016
 
 
 
 
 
 
 
 
 
 
Total revenues
 
$
2,608,355

 
$
2,782,449

 
$
2,823,176

 
$
2,673,632

 
$
10,887,612

Gross profit
 
389,101

 
410,119

 
406,668

 
389,181

 
1,595,069

Net income
 
34,291

 
46,580

 
35,366

 
30,828

 
147,065

Basic earnings per share (1)
 
1.47

 
2.12

 
1.65

 
1.44

 
6.67

Diluted earnings per share (1)
 
1.47

 
2.12

 
1.65

 
1.44

 
6.67

(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.