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Unaudited Quarterly Financial Results (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Information
 
 
2012
 
 
Dec. 31,
 
Sep. 30,
 
Jun. 30,
 
Mar. 31,
 
 
(in thousands, except per share data)
Revenues
 
$
401,659

 
$
388,283

 
$
282,685

 
$
167,078

Gross profit
 
$
121,282

 
$
119,039

 
$
88,954

 
$
55,048

Net income
 
$
11,322

 
$
17,433

 
$
8,515

 
$
5,383

Earnings per share:
 
 

 
 

 
 

 
 

Basic
 
$
0.22

 
$
0.33

 
$
0.19

 
$
0.14

Diluted
 
$
0.21

 
$
0.33

 
$
0.19

 
$
0.14



 
 
2011
 
 
Dec. 31,
 
Sep. 30,
 
Jun. 30,
 
Mar. 31,
 
 
(in thousands, except per share data)
Revenues
 
$
161,790

 
$
162,370

 
$
143,683

 
$
129,438

Gross profit
 
$
53,629

 
$
54,528

 
$
48,794

 
$
43,154

Net income
 
$
7,501

 
$
7,767

 
$
5,865

 
$
3,164

Earnings per share:
 
 

 
 

 
 

 
 

Basic
 
$
0.20

 
$
0.21

 
$
0.16

 
$
0.09

Diluted
 
$
0.20

 
$
0.21

 
$
0.16

 
$
0.08