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Selected Quarterly Data
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Data
Selected Quarterly Data (unaudited)
The following table presents unaudited selected quarterly financial data for the two years ended December 31, 2015. The operating results for any quarter are not necessarily indicative of the results for any future period.
 
Quarter Ended
(In thousands, except per share data)
Mar. 31
 
Jun. 30
 
Sep. 30
 
Dec. 31
2014
 
 
 
 
 
 
 
Revenue
$
1,625,777

 
$
1,709,132

 
$
1,721,024

 
$
1,684,131

Gross margin
651,884

 
671,059

 
664,411

 
664,559

Operating income
173,834

 
173,596

 
156,188

 
146,250

Net income
104,653

 
104,882

 
91,515

 
80,469

Basic earnings per share(1)
$
0.35

 
$
0.35

 
$
0.30

 
$
0.27

Diluted earnings per share(1)
$
0.34

 
$
0.34

 
$
0.30

 
$
0.26

 
Quarter Ended
(In thousands, except per share data)
Mar. 31
 
Jun. 30
 
Sep. 30
 
Dec. 31
2015
 
 
 
 
 
 
 
Revenue
$
1,773,912

 
$
1,838,070

 
$
1,831,732

 
$
1,748,919

Gross margin
699,479

 
723,944

 
712,779

 
697,327

Operating income
185,926

 
200,285

 
166,745

 
151,671

Net income
107,095

 
119,722

 
101,346

 
95,060

Basic earnings per share(1)
$
0.35

 
$
0.39

 
$
0.33

 
$
0.31

Diluted earnings per share(1)
$
0.35

 
$
0.39

 
$
0.33

 
$
0.31


(1)
The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in weighted average shares outstanding throughout the year.